8 episodes is way too short for Doctor Who. The core of the show is the Doctor + Companion(s) relationship(s) and there isn't any time for that in these Disney seasons.
Iiirc Gatwa was supposed to stay on for longer but Disney refused to commit either so he made the best decision for him and quit. I loved his Doctor I wish we'd got more of him (and him & Belinda!)
Shorter seasons can be fine for plot-driven shows, but that is not Doctor Who.
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Shorter seasons can be fine for plot-driven shows, but that is not Doctor Who.