When it comes to Steam, I wouldn't mind Planet Coaster being on it but I honestly don't care either way. Now when it comes to the modding community, I personally dislike the Steam Workshop. It installs the mods for you and can create a mess when it comes to your files and doesn't allow you to manage them yourself. I'm a long time Skyrim modder and I trust myself and programs like Mod Organizer or Nexus Mod Manager (now that it supports Virtual Data Folders although still not on the level of MO) than Steam putting it in my files themselves with no idea on how their load order or no way to decide which file may have overwrite priority and so forth. Not to mention that some mods may not work correctly with others or may just have issues themselves and Steam likes to make money off of the modding community. I don't want to pay for mods that may not work as intended and would rather use the mod and make sure it works correctly and then donate to the mod creator rather than paying for a mod that the mod creator only gets 25% of the sales from because of greedy big name companies.