With an ordinary fretted guitar, you can sort of perfectly tune it to what you play but not perfectly tune it in a global sense.
That’s an issue with tuning instruments in general, and why pianos are generally slightly out of tune as a compromise.
As you get used to a particular guitar and strings, as you train your ear, you can also learn to work around the imperfections by adjusting how you hold down the strings (even with a fretted guitar, you can slightly repitch a string by holding it differently).
Classical guitarists are used to pushing nylon strings into consonance by compressing the string either towards the nut or the bridge. Not so easy with steel, where players will just preemptively retune to whatever chords are most prominent in the song.
I play with generally lighter strings. 8.5-40 mighty slinky fender scale. I noticed when I switched my fingers pay much more attention to pressure, and being in tune with microbends.
Been thinking of going a bit lighter recently, and also getting a classical.