Why Buffet worlds won't be enough..
Now don't get me wrong, I like the ideas of buffet worlds very much as it opens up a whole new load of possibilities, however in there current state there is no way they could replace customized worlds.
Although I haven't tried the last few snapshots or pre-snapshots yet, unless something has changed you can still only have one biome type per buffet world, and this is were it falls apart. It's very limiting only having the one biome, especially for builders. In order for buffet worlds to be more substantial i believe they need to be able to add the option to choose multiple biomes for whatever set up they are based on - The end, the nether, underground, caves etc. Playing buffet worlds with multiple biomes on these set-ups would be like a new form of amplified setting and give a much more rich experience IMO.
Why we need customized worlds still:
I created the following pictures in 1.12.2 using customized settings and this is why we need to retain these worlds:
I can only hope they do keep to their word (Mojang), and return customized worlds in a future update; and expand upon the buffet idea.
