imo solid tabletops are much better for pizza making. i’ve worked at a few places and in practice those pans get ACTUALLY cleaned much less often than a regular ass table does.
Realize that "clean, sanitized surfaces" is a VERY relative term in foodservice. Also more times food is handled, more chance of cross contamination. The gloves/hands that put that cheese back in the have supply may have just handled sausage/deli meats or underwashed tomatoes containing listeria, now your cheese had extra "flavor" potentially. More of a risk in scenarios where the food isn't then reheated above temp that kills bacteria.
Basically, ideal path is ingredients prepped in sealed/clean factory process, handled once from safe storage into your meal with clean gloves
From working at a pizza joint as a kid, I can tell you that most surfaces are sanitized at the end of the night and covered with plastic wrap so we could start fresh in the mornings.
To be fair, from a food-conservation standpoint, I’d expect cheese (and other materials) to be re-used. No need to throw it away just because it fell on a reasonably clean surface, especially prior to baking.
They shower the pizza with cheese, and any cheese that doesn't land on top of the pizza is collected and used for the next. Pretty standard practice when making food