I think it very depends on your hardware. I, personally, never had problems with it, on thinkpad which I use right now WiFi drivers were out of box even in Gentoo minimal ISO(It uses iwlwifi). But, every hardware that I have is about 10yo. And I think I haven’t any non-intel WiFi-cards.
But also one of my friends had to compile drivers for his card manually from github, and second friend had issues with his WiFi constantly disconnecting which we couldn’t solve.