You maybe you're on to something - I have seen (and read about) large tenons with rounded edges, say radiused to about the size of a 1 1/2" auger.... Maybe it was REALLY cold that day when the lead carp was giving instruction.

So the timber exits the machine and is placed on sawhorses for 'hand tuning'? Also, a final planing is done to fit into housings?

I have seen a 'hundeggar floor joist' - are some 'traditional' housings omitted when this style of 'drop in' joiney is permitted?