Flat tires is just part of biking. Much worse on paved roads than gravel. I ride 20 miles per day and patched tubes more than 100 times over the past 9 years. The puncture liners help but don't prevent all flats.
My current heavy vehicle, I've clocked up 120,000 km with 1 x flatty. I buy expensive tyres now since that saga with budget sale tyres experiment.
6’3 245 shouldn’t be a problem. The pedaling function is a bit weird at first. But as you said, you don’t even need to pedal whatsoever. The throttle is all that’s needed, it’s up to the rider.
yeah like BK88 said, flats are just part of the game. luckily my pops is a pro at bikes and he can replace my tubes like it’s nothing. The only thing is the tubes/tires on the RX Super73 aren’t your atypical sized tire size. The bike shop near me thankfully has had the size I need in stock, runs me about $40 bucks a pop.
Trail riding much less a problem. Rode trails in Steamboat Springs for 10 years and had just 1 flat. Pavement riding a bigger problem. Easier to patch a tube or replace with a spare tube than try to find & patch a small hole in tubeless tires. Ride in the rain quite often during the summer (FL) so patching tires in the rain doesn't work so well.