I’m coming from a shop where the Spoil board was replaced on a bi-weekly time line and the was no need for it . We had a Vacuum hold down system and once you learn your machine then you should be able to cut through your material at the proper depth consistently. Someone changing a tool and not zeroing out the Z-height will put a stop to may a thing.
Waste boards on these machines can be very time consuming so I’m sure many people take alot of time and care in maintaining them.