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And no, it doesn’t run worse
Flatpaks that aren’t official products of the source project sometimes have interesting issues pertaining to their permissions, are harder to set as the handler for files, harder to enable usage of system tools, don’t follow system themes, are harder to start or use from the command line, and yes start slower than native apps.
I like the idea that even stable distros can have latest stuff easily or distros which don’t package a given project. I use a few myself. It is certainly annoying that it ends up teaching people about what dirs they need to share with flatseal, flatseal, desktop files, and the command line for something which is supposed to simplify things.
Kinda feels like less work to use rolling release with a more comprehensive set of packages.
Everyone has a right to go their own way. Everyone has a right to have an opinion on how you go your own way.