You make some excellent points. My take is this:
The whole series, Logan has been telling them that they are all still children and not serious. They play pretend and dress up, but they don't fool anyone except themselves. Not the Gerris and Franks of Waystar. Not Stewy. Certainly not Matsson.
So they give us a scene where they are all together at their mom's house and they are having fun like they did when they were kids. And we're all charmed for a moment because we think we're seeing a softer side of what their relationship once was.
Then you get the boardroom scene and the fight. And what you see is them still as children, only now they are being petulant and whiny and fighting, and none of it really makes sense.
I think what we're supposed to realize in those two scenes is that these people weren't regressing to childhood in individual moments; they never developed. They are still children. The scene at the mom's house wasn't a bit of reminiscing. It was them being children because they are children that have spent 4 seasons putting on dad's hat and tie and looking in the mirror while "playing" work.
So of course they are still children at the end. And their fight really doesn't make sense and is a lot of "nuh uh!" and "yeah huh!" because that's how children fight.
If you think about it, the only person they actually fooled into thinking they were important was their little cousin, and of course the little cousin thinks the "cool cousins" are important and wants to be in with them
The whole series, Logan has been telling them that they are all still children and not serious. They play pretend and dress up, but they don't fool anyone except themselves. Not the Gerris and Franks of Waystar. Not Stewy. Certainly not Matsson.
So they give us a scene where they are all together at their mom's house and they are having fun like they did when they were kids. And we're all charmed for a moment because we think we're seeing a softer side of what their relationship once was.
Then you get the boardroom scene and the fight. And what you see is them still as children, only now they are being petulant and whiny and fighting, and none of it really makes sense.
I think what we're supposed to realize in those two scenes is that these people weren't regressing to childhood in individual moments; they never developed. They are still children. The scene at the mom's house wasn't a bit of reminiscing. It was them being children because they are children that have spent 4 seasons putting on dad's hat and tie and looking in the mirror while "playing" work.
So of course they are still children at the end. And their fight really doesn't make sense and is a lot of "nuh uh!" and "yeah huh!" because that's how children fight.
If you think about it, the only person they actually fooled into thinking they were important was their little cousin, and of course the little cousin thinks the "cool cousins" are important and wants to be in with them