It is actually relatively easy to reschedule the N400 interview. The process is outlined in current-era interview letters.
But I do agree wholehertedly with your underlying point: with USCIS, bird in hand is worth TEN in the bush. If it were me, I'd work around the scheduled dates as much as possible versus throwing surety back into the wind by rescheduling. Life happens, but I would not increase my time with USCIS if I didn't have to.