The problem with bootstrapping is that eventually you'll hit an inflection point where the viability of the business model starts becoming visible. At that point you'll most likely start attracting competition. Unless it's a niche a business with a small TAM, your competitors will most likely raise VC funding to throw cash at hyper growth in a way you can't while staying cash flow disciplined.

In today's environment VC capital is nearly ubiquitous. So you have to assume that sooner or later you'll run up against VC-funded competitors. If you don't have a game plan to survive as a bootstrapped business when that day comes, then you pretty much have to raise VC funding.