I don’t want to tempt fate but so far I have been pretty lucky (another vote for Marathon Plus)
Generally I just need to tension the chain (singlespeed). I can’t imagine this is related but I have had a rear wheel coming loose incident 😉 Popped in too nearest bike shop to ask for a spanner.
Other than that one puncture and replacement of brake pads which I see to myself. Oh, and my latest bodged mudguard tends to come loose.