Thanks for your answer. That's actually some good news, but still I guess there is no "random playing" in strat for single players who are not willing to organize with as many other players as possible?
You can run around the map solo but it's a lot more fun and easier to accomplish things when you're working with a group, even a small one. I think it was BASNAK and his small clan that somehow captured a Grey Order castle (one of the biggest clans) by themselves for a minute early in this version of strat, so there's all kind of hijinks you can get up to. It's a sandbox though so people play strategus pretty much the same way they play cRPG. Some min-max, grind and want to rule the world and others have themed builds/clans, roleplay and don't care about who controls what territory.
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Here's just a couple examples of things you can do as a solo player:
Trader: use open fiefs to make gold or else ask factions permission to use their other ones . Then you could donate profits to factions you like or sell it for cRPG gold.
Troop farmer: sell your troops you get from playing cRPG for cRPG gold. I did this with a japanese clan early in strat v.3 and we made a ton of gold.
Mercenary: There's a couple small clans that do this, building up armies to sell or leading attacks themselves.
Bandit: harder than it used to be without AI fiefs but still possible.