Mainly because people cannot have uber mob farms anymore due to an entity wipe. Lets more mobs spawn.
Is that actually legit spawning? concentration of creepers and skeletons with not a single zombie in sight has me wondering if that's not just mob eggs.
Exa they are all natural. I saw all these creepers and i led them into 1 spot for the photo. They didnt spawn all together. And bajj, you can catch creepers, however it is a 1 in 200 chance and it takes 64 redstone