Question about routers and access points

Hi all, I've had a Netgear XR300 serve me fairly well for the past 5 or so years, but in the last few months I've had increasingly frustrating levels of failure. Things like sustained 100% CPU utilization, individual machines connected but unable to access internet, being unable to access the router admin page, individual machines suddenly having their ping go to 500-2000ms and bandwidth down to the kB range (I have symmetric 300Mbps up/down).

As a potential, I've been eying the Firewalla Purple to become my new router for a few reasons (Netgear not getting security updates, Firewalla has Wireguard support, etc.). The Firewalla only has short-range wifi, so my question is this:

Would using a Firewalla as a router and using the Netgear device as an access point for wireless connectivity be likely to mitigate these kinds of issues?

I've realized I lack the knowledge on which aspects of connectivity would be handled by two discrete devices, so I'm hoping to suss out if this is a viable solution.