In the videos I have seen it does both in the same print - poop and a waste block. But that might have been slicer misconfiguration. Although from the amount of times I have seen that makes me wonder: is the default config in Bambu slicer not taking this into account or all of the reviewers don't know how to configure their own preferred slicer. Just checked and 8/8 reviews of BambuLab A1 mini from channels that specialize in 3d printing showed purge tower.

Am I missing something? Doesn't the poop during change replace need to purge into a purge tower? Are there any additional purpose for the waste tower beside purging any remains of previous filament from hotend?