In EU at least plenty of Pfizer and Moderna vaccines are still incoming, so there are actually alternatives to AZ.

Do not forget that these vaccines are still very new, plus there's the possibility of a production issue with the AZ vaccine that affects only part of the production; I wouldn't say it's "politically-motivated" or a dumb idea to pause AZ vaccinations until one does a deeper investigation; I personally chose to avoid AZ due to a history of strokes in my family, I preferred to reserve a spot on the Moderna list. Better safe than sorry.