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Guitars are not perfect. In fact most studio musicians have to retune their guitars for certain chords. Or should i say they have to tweak the tuning because in different places on the neck chords will be slightly out of tune so the musician will tweak for that chord, then they “punch” the chord into the song.
I don’t have one, but the Taylor V-Class bracing has done a lot to improve on the in tuneness of the guitar. I have seen a video where one studio musician was amazed when he tried the V-Class bracing and made the statement that he would not need to tweak that guitar for certain chords.
Regarding string life, lots of factors go into string life. How hard you play, how often you play, do you clean your hands before playing, how much acid is in your sweat, are the strings coated, humidity, etc. As you gain experience, you will get a feel for when it is time to change your strings with your conditions and playing style.
As for me, I can usually get 2 months of use out of strings, longer with Elixirs. I also almost never tune my B and high E strings to pitch. They are always slightly flat. The important thing is that all strings are in tune with each other.
The biggest plus here, you are learning to distinguish pitch and are starting to hear when things are not quite right. That is a huge win.
John