Yes, no, no, I mostly run pre-published material, either campaign arcs or something stitched together from shorter adventures. We are all here to have fun, if the players do not want to go there, I am not going to force it. I am not creating art, and am in the least bit precious about the campaign setting and themes.
If the players want to create some stuff, I will generally try to accommodate them.
I suspect that a lot around here would consider us to be playing at a simple and superficial level, but I think I have never seen a player delve into the deeper lore of a world. Hell, I do not think they ever even keep notes.
I could see how this works for you. I use the VTT whisper on a macro for each player, so I do whisper alot of specialized knowledge to the wizard or warlock. There is a buttload of lore... so depending on your playstyle and campaign purpose. Mine has alot of mystery-solving. The wizard has been filling out the VTT journal.
EACH class has played their parts quite well, sometimes in unusual ways. So people saying why not so-&-so class doesn't hold up in my game. It is just that, the warlock, by nature of "pact" is a more contractually set class at an individual basis than others. Yes, the fighter, probably "worked for the man" at some point.. maybe not, they don't have the same supernatural hard-wired obligation.
The party wizard, gets whispered lore frequently to present however she would like to the party, playing the keeper of knowledge.. she also has stank wizard-eyes. I also canonized that she loves mind-expanding ground pixie dusts or gets an itchy nose if the party defeats a magical being.
The Warlock... boy that one is alot to unpack. The player picked the patron type and said please make the rest a mystery. Basically BOTH parties in that pact made the pact under duress. I love the reminders I have seen though that sometimes the warlock can actually be in the position of authority with the pact - "Give me back my blood Joshua!!!"
The fighter deals with his killer side regularly, now with a cursed weapon on-hand I will force him to deal with the downsides of being a soldier, with some moral compass stripping away.
The monk, raised by wild animals in the Veldt. Embraces the nothingness of the wastes quite well.
Long-winded way of saying it is not easy to guess, but there are a lotto homebrews keen to world-building