Do you have some specifics? I'm looking at the 1.13 "plan" and I see:
- A whole lot of command block changes. Certainly be annoying for people who use those a lot having to rewrite them all I suppose.
- Texture changes. I personally am not a fan of the ones I've seen but I hardly think its a massive change to the game, especially since texture packs are still a thing that exists and someone will almost certainly release a "classic textures" pack within hours of 1.13's release (probably within hours of its first RC for that matter,) so it would be trivial to revert if you wanted.
- Precious little else.
I'm not sure what you (or Reddit) is super concerned with here? The rename to "Java Edition" I know is something everyone complains about (because you know, that title screen logo is the most important part of the game!) but that was already done in 1.12.2 and therefore not part of the 1.13 plan..
Is there something major that just.. didn't get mentioned on minecraftwiki's 1.13 pages?
Your personal game can be reverted, to be sure, but think about it. These new, worse textures will be plastered EVERYWHERE. Merchandise. Youtube. Reddit. The majority of Bedrock Edition users. This will become what people see when they find something "Minecraft".