Incredibly rare large flat areas after 1.18

The new caves and cliffs are great, but it took hundreds of starts to find a large flat area (found mooshroom islands 3 times before finding one).

I've generated 100's of random worlds since the 1.18 update, pillared up 64 blocks off the tallest local peak and looked around with a 95 chunk render distance.
The largest flat areas I see are maybe 50 blocks across.

My main focus on starting a new game has always been to look for a very large flat area (100x100, small pits and bumps were ok) to build a large farm and houses on. I now have to spend hours clearing and leveling each time I start a new game.