1000% agree, distribution strategy and ideally a unique way to drive adoption built into the product or service creates the most value and thus optionality for founders.
I've personally tried many bootstrapped companies with little success but a couple that did get escape velocity (one hit 9 figure revenues by year 8), the common denominator was a well-thought out, embedded customer acquisition tightly integrated into the core product. Very hard to couple given how excited we tend to get building a solution to a problem we see. But super critical, really good insight here.
Sure, no questions that sales and stuff are crucial. And solo-founder is not just dev - he must be everything. But the idea is - now there's way more chances to succeed.
The most important one is a customer acquisition.
There is an ocean of cool but dead software products and a sea of mediocre successfull ones with the right business model and sales/marketing strategy/budgets.
If you stay solo while in the large and profitable market - you're either stay very small, get flushed away by a competitor with big money or become the competitor with big money.