Harder mobs with progression

Minecraft gets a little easy after a certain point. I think to fix this, we should have stronger mobs start to appear. These mobs would start to spawn after certain milestones. For example, after entering the nether, new mobs should start to spawn in the overworld. These mobs wouldn't be improved old mobs, they'd be completely new. This would also happen for when you enter the end. Reasons I think this would be a good idea: Players who don't want to beat the game and just want to chill in their overworld and work on projects won't have to have harder monsters. Players like me who work on projects and think the game is to easy would enjoy it. If you don't want the new mobs, you won't have to enter the other dimensions Cons: Explorers may want to enter the other dimensions. Multiplayer worlds How to fix: I believe there should be a toggle in the world menu to enable this idea, making players able to play how they want