My experience working on B2B in a bigger company is that enterprise accounts can be extremely demanding. They want you to be engaged while closing the sale and whenever they feel like it for the entirety of the deal.

My clients were the type of folks who didn't want a link to documentation, they wanted me to turn that documentation into a powerpoint and spoon feed it to them.

If you can satisfy these folks and do engineering at the same time good on you

Serving B2B clients requires more time than you'd have as a solopreneur because they require a lot of handholding through the entire lifecycle. Even a small SaaS company can have 5-10 people touching a deal in some form (marketing, sales, sales engineer, etc) before its closed.