For me the cost financially to buy modules and space required for a studio are really the only negatives. I do mostly weird experimental stuff that modular seems to excel at compared to traditional synths and I spend all day at work on a computer so the hands on tactile feel of patching cables to make sound is very attractive therapy. Plus I was not able to travel for vacations overseas for 2.5 years so the money I would have spent on vacations was funneled to modular instead. Love it! But now I have a lot of modules and no need to buy anything for a long time until I can master my gear and make tracks I enjoy.