I know everybody is all emotional, and rightly so, about this past weekend but at some point you have to realize that nature is nature and does nature things and sometimes those nature things don't work out well for us humans. It's a sad and hard fact of life and no amount of government or warning sirens or anything else will prevent it from happening.
ANY area that is generally of rocky terrain and comprised of hills and valleys is going to have flash flooding as a component of living there. Just like living next to a volcano comes with the risk of earthquakes and eruptions or living next to a fault comes with earthquakes or living on a coastal area comes with tropical storms and hurricanes and flooding as well, etc, etc, etc. There isn't a place on this earth that doesn't have some kind of risk associated with the regional ecosystems - mother nature have designed things that way. We do more to exacerbate natural phenomenon by thinking we can control it because man is arrogant.
You also need to understand that this was just an absolute freak event that was the confluence of the remnants of a pacific tropical system slamming into the remnants of a gulf tropical system and that combination created a pretty unusual weather event that was very similar to Harvey in the fact that it dumped a metric crap ton of rain on a relatively small area over a decently long period of time and didn't move much due to the two opposing forces of each tropical system. And did it all in an area that simply doesn't have the geographical capability to absorb that much water, which means that water does what water does and finds the path of least resistance to the lowest spot it can.
When it comes to people - unfortunately people are people and few things really change that. When you have a lot of people that aren't native to an area and don't really fully understand the concept of flash flooding combined with the fact that we have more and more and more people these days that didn't climb trees or swim in creeks or jump dirt bikes over home made ramps outdoors as kids and simply don't have that "thing" that comes inherent with spending a lot of times outdoors, when bad natural events happen the results tend to be compounded because of the lack of that little voice in the back of your head that kicks your spidey senses into high gear.
Also - how many people even bother looking at their phones anymore when a warning alert comes through? Very, very, very few. We are so condition to have a Pavlovian reaction of reaching over and hitting the mute button because we want the noise to stop these days that alerts have lost a lot of their meaning and don't carry the weight that they should. No different than me on a construction site being so accustomed to backup alarms going off that I catch myself not even paying attention at times to when a piece of equipment is blaring one off in my vicinity. With all of our technology it has become the boy that cried wolf in a lot of aspects because we are constantly inundated with alerts and noises and what not.
Throw all of this together with the fact that the water started rising in the dead of night and that, as we have all seen umpteen times on facebook and instagram, the rise - while fast - isn't an Indiana Jones style wall of water that you can hear from miles away. It's a steady rise that is like a barrel proof whiskey in that you don't often realize it's happening until it hits a critical point and by then it's too late - just like that whiskey doesn't seem like its doing much until you realize you are passed out in a pasture somewhere because it just jumped up and whipped your ass.
The other issue is that assume this magical system that saves the world is created and installed - the first time a false alarm happens heads will roll and that system will become what most other systems like that become - dust collecting relics that don't get used because people that run them are afraid of false alarms and causing widespread panic when nothing happens. Or, much like with tsunami alerts - the alerts do go out but since the last 2 dozen times they went out nothing happened - they get ignored the one time ish gets real. Because that is what people do.
Are there lessons to be learned? Absolutely. But this didn't happen because of a lack of funding for the NWS - in fact there were more people on duty than normal. This didn't happen because of Trump DOGE cuts (those havent gone into effect yet) or Texas lege not passing a bill. This didn't happen because of the made up crap of man made climate change/global warming. And the answer to those lessons learned is absolutely not a new government bureaucracy that will do jack and squat except point the fingers at whomever it is convenient to point the fingers at next time it happens. And it will happen again, because it's the hill country and that is how nature works. There were flash floods 50,000 years ago. There will be flash floods in the future.