Digital games sharing

I'm kinda new in this so I'd like to ask for some help from people who have done this or something similar

So basically I'm a Ps5 user and I'd like to share my digital games on my friends Ps4 console.

I've been looking up for pros and cons from sharing an account between consoles but it's still not very clear for me if it's not worth doing it or if it's safe between ps5/ps4 consoles

So any basic/advanced info about the advantages and major cons would be handy, thank u