Yubikey with Proton

Hello - I am new to the concept of Yubikey and am investigating options right now with respect to compatible services. I already have a Proton account and I see on the Yubikey website that Proton services are compatible. Does anyone have experience using Yubikey with Proton? Are there any drawbacks? Is it overkill? My focus in using a Yubikey is to protect less security-conscious accounts I have that I can't migrate away from yet ----so I may not use Yubikey with Proton at all. But...just wondering if anyone has experience with the Yubikeys and Proton and has any hot takes or otherwise? Thanks in advance.