However, I think that most small fish lazy people prefer easy one click solutions for privacy, and bigger players are using JoinMarket, that is why they probably have much bigger volume.
Maybe. But even if JoinMarket is largely being used by bigger players, there is nothing stopping the average user from getting involved too. It's not like Wasabi where they are sacrificing the privacy of the average user to cater to the bigger players.
Do you know if it's possible to use this with pruned Bitcoin node as well?
I've not tried it myself, but I don't see any reason why not, provided the wallet you are using for JoinMarket is fully synced and up to date. A quick search of their GitHub shows a couple of users who seem to be using pruned nodes without any issue.