It's not a stupid question
I don't think you have to make all your tracks mono to sound good in clubs, what you have to take care of is that the track is mono-compatible, especially in the low end & for your kick & bass. Working in M/S ( Mid / Side ) mode can help with that, you could for example set a 80Hz frequency amount that will be 100% Mono and have some side & stereo information above that point.
Many producers will make a club ready version of a mix just to be sure it works well on Mono PA systems and a stereo version for anything else like digital distribution or CD, vinyl physical releases but if you work with only one version, then it's important to check that Mono-Compatibility while mixing the track.
If you have an audio interface with a reachable Mono button, be sure to use & abuse it , in Live you can stick a utility at the end of your master channel, set it to 100% Mono and link a key command to its ON/OFF function to reach for it easily.
If doing it by ears, you don't want the track to sound extremely wider & different in Stereo than in Mono, if it's the case, chances are that the track won't be Mono friendly in a club, but if the difference is "acceptable" then it should work. Some visual tools & plugins can help too.
But yes, if you want to do it right and avoid issues, making a separate club version of a mix is the way to go IMO, of course it requires more work & time, so that's also something to consider.
Hope that helps, cheers !