I know this is very late but the term you’re looking for is “Access Point” often abbreviated as AP.

“Mesh access point” search should come up with the right products, probably mostly UniFi. You can also roll your own with some second hand routers, if they support mesh like Asus AiMesh or via custom firmware like OpenWRT. But that requires a bit of skill/learning and time.

Certainly not an expert here but the GUI “being there” means you can configure something about the traffic flowing through, maybe VLANs or QoS. That also might be why some switches have fans. Deciding what packet has priority or is allowed is a bit more computationally complex (read: heat generating) than just pushing a packet to the right address.

You might want a VLAN if you have a server connected to the same switch as your PC, but they shouldn’t “see” each other. If you didn’t have a VLAN there, your router or firewall can’t manage anything about the connection. Say you have a website and database on your server and only the website should be accessible by your computer, you’d be able to configure that with the firewall.