As an example my modern Husky seat has one Dzus fixing plus a push-in front connection, 3 seconds has its seat on or off. My Atlas now has its 2 seat plastic spacer washers silicone in place, one went AWAL once lucky I found it. Just to get access to the seat bolts it needs 2 wing nuts removed off the rear rack, 6 bolts off the pannier racks, and 4 bolts off the plastic side covers pulled. I at least tried to make it so one size Alan Key fits 80% of this. That's why I fitted a better version of remote battery charger connection. So it doesn't take an hour to assess and connect a battery charger. I tried drilling an access hole through the pannier racks to get at the seat bolts but that was a bust. You cannot win them all.