I mischaracterized what I was framing as "static" IP addresses. The last couple of Netgear routers I've used have a feature they call IP "Reservations", which assigns a permanent IP address to a network adapter based on its MAC Address. Using this feature leaves the "Obtain an IP address automatically" setting of each device unchanged. This has been an approach I preferred because most devices are defaulted to this setting.
If I don't leave the PC's DNS setting at "Obtain DNS server address automatically", what address do I enter to use my ISP's DNS server? I used to use Cloudflare and then tried Google before I was encouraged to switch it back to my ISP (automatic defers to router settings) to reduce errors. That has not seemed to make a difference.