It also would be great to see the actual bpm and not only %. I know that later levels are being played at a faster pace, but it would be nice to be able to speed up things in all workouts, as it now caps at 125%.

agree its too basic. Needs whole neck scales and also needs exercises for bass. They could be all the stuff from guitar just for bass. Def need arpeggios as well. Would like to have more chord choices for the chord trainer to. We need more chord extension, 9th 11th 13th etc.

Agree. Too much emphasis on playing tabs across a screen and almost no explanation at all as to how/why a song or exercise has been selected and what you will learn from it

The scale lessons are pretty basic. They might show a pattern and have you play it in different keys. I would like to see it have you play the scale in the same key up and down the neck. Or even let you pick the key then play it up and down the neck. Or maybe a backing track you can play the scale over freestyle and it just tells you if you hit a wrong note,

I second that.
Also I feel like it would make sense to arrange the "Workouts" section in way similar to the "Missions" one.
Then all the workouts would be arranged both by level and purpose, so that it'd be easier to practice skills relevant to your current goal and level, and this way the progress would be more gradual and smooth.

The arpeggios and scales section are great but you do need to add more exercises focussed (both with and without a guitar) focused on straight, flexibility, speed and a warm up stretching section. This will improve the playing skills of the student way faster also a hand health and tips (like the one you have for te singing lessons) would hep many ;)