Passive mobs should spawn more in harder biomes

Have you ever tried to load up a new survival world only to end up in a jungle or a snow biome or somewhere else where you can't seem to find any passive mobs for food? With this feature, passive mobs can spawn in any overworld biome above the surface. This allows you to play and live in any biome.

I don't know about you, but I have always wanted to have a jungle survival world with a cozy treehouse only to find out that it's almost impossible to find any mobs to get food (unless you use melons (horrible saturation) or cookies (expensive and not filling)).

I've always thought that mobs not spawning much in these places is kinda dumb, because players who spawn in these biomes will likely immediatly journey to another biome or just make new worlds until they get a good one.

This feature would greatly improve the exploration and variety of the game by making more biomes accessible in early game.