TL;DR
Copy feature from loading save know as "activate needed mods" to te multiplayer part of the game.
As I was trying to join some multiplayer server with Bob's mods to learn something about "how to Factorio", I was kinda blocked, because of the other mods.
While I understand that this feature cannot (yet?
) download missing mods for me, but in singleplayer it can activate needed. It would be much helpful, I think, to have this ability while joining in MP sessions. Writing down list of mods needed (and their versions, which is whole other story, sadly), is not exatly user friendly, and, as I said before, when this funcion exist in game already.