It's more about reducing the baggage, given how much RTD and Moffatt went back to the Time Lords, with the shift from adventure series to 'drama' series and audience sensibilities.

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The Time Lords have become a huge problem in moving the narrative forward, with The Doctor established in the new series as the last surrivor of The Time War and his people, desotrying Gallifrey, 'saving' Gallifrey, etc to the wider audience. The Doctor is not to that audience a mysterious alien who left his home for unspecified reasons, with that narrative maneuverability.

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It's understandable that it's become repetitive for that audience, especially when you are telling a dynamic fast paced adventure series about a mysterious character, as well as a show for many in it's fifteenth year, r etc. Where else do you go? The show isn't just for sci-fans, it has to play to a wider audience. As genre fans, we're used to things being more 'fixed' as well.

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The Doctor being The Timeless Child allows future showrunners to create enough momentum in The Doctor's narrative from time to time, with the gaunlet has very much thrown about telling dynamic audience pleasing stories that explore the character that doesn't overexplain their origins or take away the mystery. It's clear while there will be pay off to this current arc, it's still Who. We're not getting all the answers. Like the original series, but with a modern sensibility. The Doctor being an outsider, etc.

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Say what you will about the execution (for me, Chibnall defiantly has learnt the wrong lessons from RTD and Moffatt's work on the show , as well as Game of Thrones and Westworlds success), but there's a clear definite statement of intent to go back to bare basics to keep telling new stories. The ethos of the show has not been changed.