Gutenberg encodes semantics in comments and inhibits migration and interoperability as much as any of the other proprietary plugins you are complaining about.

Gutenberg is first party. It's either WP or a 3rd party, I know who I would pick.

I think that is normally a good rule of thumb, especially when first party has a track record of accomplishment. It's one that I embrace. I am trying to stick with the original editor and find it increasingly hard as all of the design elements are now requiring Gutenberg. To be clear, I am not advocating for another page builder over Gutenberg, just not embracing Gutenberg because it embeds semantic elements in comments and if and when I need to migrate off of WordPress I don't want to be stuck. I have been using WordPress for 18 years, which is a long time for any technology platform. I don't have plans to migrate but I don't want to foreclose any options.