Moreover, just a few years ago I was in a position where none of the free services I tried would allow me to report a specific form of taxable income I received (a stipend paid by a university in the form of a reimbursement that wasn't reported as W-2). I literally spent 12+ hours on my otherwise very basic taxes just trying to navigate the interfaces for the "free" services.

I ended up switching to the fillable forms after that; lo and behold it turns out it's a tiny adjustment to one line on the 1040 and is clearly explained in the instructions. If your taxes don't change much from year to year it's trivial to work out the form each year. Like you it's always taken me about 30 minutes after gathering the various forms together.