Search online for "AFCI" along with any appliance that has a motor in it, like a vacuum, refrigerator, or hair dryer. You'll get pages of posts of people asking why the appliances keep tripping the AFCI breaker.
The reason why is that those devices create arcs, and AFCI breakers are completely unable to handle them. Some regions require AFCI breakers, so a significant portion of household appliances will occasionally trip the breaker.
The worst part is that it isn't particularly consistent, so your fridge could last for years without tripping it, but as brushes wear the arcs they regularly create increase the chances of a trip, until one day you find that all your food is ruined, because the AFCI breaker tripped at an inopportune time.
Fortunately, my fridge trips the AFCI very reliably, so I was able to detect it before losing any food. All I had to do to fix it was make a few passes with the hot wire through a ferrite bead, right before it connects to the AFCI breaker. It completely blocks the arc-created RF that the AFCI is detecting, disabling the functionality of the AFCI, all without any code violations, because while the AFCI is required, the ferrite bead isn't prohibited.
I upgraded all of my breakers to AFCI+GFCI. Worked flawlessly so far (about 6 months in).
The only two times where my AFCI tripped were 1) my blow-dryer shorted out due to a worn out cable (WAI) and 2) the PSU on my PC started tripping the AFCI (sent back to the manufacturer and got a replacement). So in both cases, at least for me, the AFCIs caught real problems.
Not a single trip of the GFCI function so far including vacuum, fride, and various power tools (and it's great peace of mind to have this with kids in the house).
All good for the average user. You cannot run a saw or other corded power tool off an AFCI breaker. it trips _constantly_. This is a problem because NEC wants AFCI/GFCI in all rooms with concrete floors, like garages. This means you basically put those plugs in to pass and then pull them out again.
The reason why is that those devices create arcs, and AFCI breakers are completely unable to handle them. Some regions require AFCI breakers, so a significant portion of household appliances will occasionally trip the breaker.
The worst part is that it isn't particularly consistent, so your fridge could last for years without tripping it, but as brushes wear the arcs they regularly create increase the chances of a trip, until one day you find that all your food is ruined, because the AFCI breaker tripped at an inopportune time.
Fortunately, my fridge trips the AFCI very reliably, so I was able to detect it before losing any food. All I had to do to fix it was make a few passes with the hot wire through a ferrite bead, right before it connects to the AFCI breaker. It completely blocks the arc-created RF that the AFCI is detecting, disabling the functionality of the AFCI, all without any code violations, because while the AFCI is required, the ferrite bead isn't prohibited.