Fat adaptation is extremely useful for long alpine days but seems to have less benefits for general training and fitness.

That’s not the case. Any activity over a few minutes is largely aerobic. The bigger your base, the better you’ll perform.

As @mariner_9 said, fasted sessions should only be done for Z1/2 and rarely longer than two hours except in highly trained individuals. You should always fuel for any session that will have an intensity greater than aerobic threshold.

…due to my schedule I have to do my fasted zone 1/2 stuff in the AM. When it comes to my PM workouts I am slightly fatigued.

Okay, that makes sense. If fasting is compromising workout quality, then you may want to drop it.

I very well could misunderstand the concept of fat adaptation but to my knowledge it’s primarily about training the body to run on mostly fat instead of carbs during lower intensities.

Sort of. It depends how you look at it. We all have a certain FatMax intensity. You could say that the goal is to increase the amount of fat burned at a certain speed. Or you could say that the goal is to increase the speed at which we are burning as much fat as we can.

I think the latter definition is better. The former could be interpreted to mean, “Okay, at slow intensities, I burn a lot of fat. I can stop training that now.” The latter implies that you should never stop training FatMax, which is more accurate.

And look what can happen if you start at five years old and never stop?

But to your question! It’s not a bad approach. If one tool is compromising another, you have to choose which is more important. Fasted training isn’t required for increasing fat-adaptation; it just seems to speed the process.