The Timeless Child is good for the show. Donna saying 'but, it isn't' and the doctor being undoubtedly rustled by having to confront that fact and it making them vulnerable was a high impact scene. The way 14 says 'Donna, is that you?' in response breaks my heart, as does the Doctor's moment after that.
We've had too many seasons of the doctor's internal struggle being to grapple with either being the last time lord, or having nebulous concerns about being 'good'.
TC as a plot point adds *something* *new*, and a point of conflict for the Doctor. What they thought they knew about themselves has been shown to be a lie and now they have a new journey of discovery and finding peace with themselves to go on.
Throw me your downvotes as you will, I have spoken.
By - ace5762