No, with all due respect, you are wrong.
The district tax rate is comprised of M&O and I&S. The latter is for bonds and that takes voter approval, to your point. But I am talking about M&O. Which, also to your point, has been compressed by law. My point is that almost every district has had their M&O tax rate at the max allowed by the state.
Furthermore, each year, when that have a surplus, they add that to their "Fund Balance" or make capitol improvements.
Their M&O has gone down due to law compressing it, not de to boards adoption a lower one because they need the additional funds from increased values.
Again, as their locale revenue increases (be cause of increase values), the state portion they receive goes down.
Now most schools, back in 2007-2009, held TRE elections, asking voters to adopt an additional .13 rate ti they M&O.
Law has compressed the tax rate form a max of 1.5 proper ton2008, down to 1.04 until 2020 when it went down again to .93 and now , in 2022 to .9164. All without the TRE.
Any school with an M&O tax rate today above .9164 has voter approved TRE which can get them another .13.
Again, it is possible for the board to local drop M&O tax rates or raise them within the limits of the law WITHOU voter elections (not counting TRE). However, it seldom happens. It did skittle more back prior to the 2006 timeframe when compression began.
Here is a link to research regarding the Hb3 compressions.
https://tea.texas.gov/sites/default/files/texas-public-school-finance-overview-presentation-2022-23.pdf