It's also easier to learn because there's one consistent mapping between notes on the page and the sound, instead of many different irregular mappings specified by "key signatures".
But traditional notation is more compact, and for music based around diatonic scales, implies information about the harmonic function of notes that could be useful for interpretation.
It's harder to learn because fingerings are based on key notes and transpositions around that.
If the key is G you don't start with your hand on C and move it up to G, you start on G and move it relative to that root.
This matters because over/under moves usually happen at certain scale points. So if you learn the scale you have good chance of defaulting to the most efficient movements with muscle memory.
If you're referencing everything to C you'll never understand the scales and their different fingering patterns.
Anyway, here's Martha Argerich playing Prokofiev's Toccata. (What happens around 3:14 may be illegal. But here we are.)
But on an isomorphic keyboard you can just move your hand up or down and use the exact same fingering. You only have to learn how to play the scale once, not a different way for each key. You don't reference it to "C", you reference it to the first degree of the scale, and the key doesn't matter. IMO, the traditional keyboard has been obsolete ever since the Jankó keyboard was invented:
> If you're referencing everything to C you'll never understand the scales and their different fingering patterns.
If you watch someone play a Janko keyboard (1) then you'll notice that there is only one fingering pattern for each tonality or chord, you just shift up or down based on the tonic. Kind of like a guitar, where there are a handful of scale/chord/arpeggio shapes that are picked for efficiency (aka, "economy of motion") and aren't tied to the particular key.
The piano keyboard optimizes the keys for either reachability (white keys are wider) or feeling (black keys are narrow but have edges and can be pressed from the side). The Janko keyboard optimizes for neither, all keys are equal. It has all the disadvantages of the guitar with almost none of the advantages (the range for one hand is smaller than the guitar's, and there's no bending/sliding/vibrato)
It doesn't because it only has a single row of keys. Piano music is full of awkward finger crossings that could be avoided with multiple rows of keys like on the Jankó keyboard.
>or feeling
You can texture or raise/lower the keys on any keyboard as you please. No layout has an advantage here.
>the range for one hand is smaller than the guitar's
Basically it uses a regular pattern of keys, instead of staggering keys into pentatonic and diatonic scales, like a piano does.
This makes it harder to "find" the diatonic scales, but easier to transpose between different keys.
You can see an example here: https://www.youtube.com/shorts/kMD1qXtDAdg