I would say freedom: I have been creating different companies for 35 years now; large ones and small ones and most of them have been because I believed the products we made had to exist. Luckily sometimes others thought so too! But even if they didn’t sell, I never stopped; I believed. Creating things that I believe should exist is not what everyone can do ; I had the luck that my first two products were hits, but very accidentally so; I never did (or do) anything with market research etc; I just built what I thought was needed, popped it into the market and hoped for the best. That is freedom, and it’s so much fun that I hope to do this for at least another 35 years.
If you really have novelty that works (makes anything non trivial money wise) then someone with vastly more money than you will clone it and make it vastly better and throw millions at the marketing. It’s indeed better to improve on entrenched competitors as they have different priorities altogether like providing ROI to investors which interferes with feature creation and pesky expensive things like support.