I’d have to agree on all counts. Possibly, lots of cafe are still using Mazzers as grinders aren’t cheap and they might not have the capital to buy the latest equipment.
Ditto on the grinds getting stuck inside the funnel & the spray. Tilting the portafilter up towards the spout helps a tiny bit, but otherwise, it’s time to get handy with your trusty paintbrush or sweeping tool of choice.