Yeah, there used to be a time like that…
A single UV for an object is a good idea…but materials/textures…
there is nothing wrong with multiple textures on an object for current game engines…
Here is an asset selected out of a recent game release…
Facade selected on the Left…Single UV map …and it really is the worst you have ever seen…and LOOK at the textures OMG … for one…Building side!!..out of a whole city!!
I’m not saying you shouldn’t optimize but with the more powerful render engines and almost unlimited storage…Games are just starting to forget all about the old day’s restrictions!
I almost forgot…one thing I would use is this Free Add-on