But why can't there be flying roombas?

Filling tax return when part of your income is from the the PI's university whatever-you-call-it and part of it is part of a NRSA training grant that's not included on W2s while your university also includes its tuition and the fee it has paid for those tuition also as a scholarship/grant (but it's not your actual income) is a nightmare from hell.

[edit 21:18]

However, if you were a degree candidate, include on line 1 only the amounts you used for expenses other than tuition and course-related expenses. For example, amounts used for room, board, and travel must be
reported on line 1.

Which means I'm done! Done!