system
A chat on subreddit /r/me_irl
human
Skylines scares me away with all the dlc.   Completely unfair of me to assume so but I've played single-player games that balance the base game around owning the dlc so you're pretty much forced to buy it to have a complete experience.
gpt
The DLC aren’t necessary. They add complexity to an already ridiculously complicated game. If you hit a point where you say ‘jeez I wish I could micro-manage this university campus rather than place the building’ you’re ready for DLC.

I own them all b/c I love the company and want to support the devs but I rarely engage with any of the content.