should 30 yr old home have some/all breakers replaced with AFCI /GFCI? If so, which ones?
An AFCI is more a protection from "fire issues" than anything you'd typically associate with "having electrical issues."

NEC allows use of NM cable in residences. NM cable is sadly prone to being gnawed at by rodents, and rodents are sadly prone to be in houses, even nice ones. Some folks estimate that a human is rarely more than 15 feet from some form of rodent (mouse, rat, squirrel etc.) I've seen multiple-feet-long sections of NM cable gnawed back to copper in remodeling jobs, and those were live, operational, and not having any electrical issues - because the copper had not touched the next bit of copper in the cable yet. IF a solid connection was formed between them, you'd expect a breaker to trip. But if something not as robust made a connection, you could get a hot plasma carrying current between the conductors without necessarily drawing more current than the breaker was rated for - and that hot plasma can set anything combustible on fire.

An AFCI is looking for the "signature" of a plasma discharge, and some of the early ones were rather terrible at discerning the difference between a fault and a brushed motor, which has tiny arcs between the brushes and the rotor. I believe they are somewhat better now.

People who should STRONGLY consider AFCI retrofitting when not required by scope of other work requiring code updates would be those with 15 &amp; 20 amp circuits on the problematic old Aluminum wiring (1960's era, vaguely) that is a particular fire hazard, and those with other "very elderly and suspect" wiring. Lacking those signature items, consider it, sure, but how critical it is will be a personal call, possibly influenced by your level of thinking your house is utterly rodent-free or otherwise.

Other things can cause arcs, such as poorly done work (loose wire-nuts, using backstab connections) or the classic 'nail into a cable' when it does not trip the breaker.