They have a very good voices and technique. In the studio recordings you can hear it.Choirs, polyphonic and impressive melodic lines.You knows. To do it just as well live is very very very difficult
The voice is like a instrument but very sensitive. There are a lot of factors, listening to monitors, mood, tiredness, throat problems, health and they can't be focused just on singing either.
So it's normal not to make it perfect. Nothing happens.
They do enough playing as they do. They play like gods and sing like humans.:)
You can't ask for more. Better is imposible imo
Use autotune in time in lives? This is crazy. Please don't. Naturalness.
Use autotune as in Roadwork? yes of course. It is a barely noticeable retouch and brings the composition closer to how it was created.
PD for some music journslist. Really? Try it yourself.