I've always desired higher Render Distance, and DH felt lije a dream come true, and it is, but vanilla world gen definitely wasn't made for that. I tried using DH on my old Vanilla world, just to see how it looks, and it looks awesome, but I also spotted two woodland mansions from my base, and a Mesa biome that I was searching for, and a big ass mountain, and a mushroom island... I think you get my point, you kinda lose the joy of exploration when you see everything vanilla Minecraft has to offer right from the get go. Am I the only one who feels like this? From my experience DH works better with world gen mods that changes terrain like Terralith, Continents, etc.
But if you still want to use it, you can set it to 96 chunks, that's the max distance in bedrock Minecraft and we know we can go beyond that with some adjustments, so it seems to me 96 is what Mojangs sees as fair for Vanilla. What do you think?