The Tetris skill level chart, I did this for fun Options

[Koplex]

Mario- I put it blank cause I have no idea what characteristics to put there
Paul- yes I agree
estrelleta- it's a brief placement with no means of specific qualifications
tox- tetrisfriends arena and Tetris battle based

[Rosti_LFC]

Now it starts getting weird because although every GM2 can achieve GM1, not every GM3 can necessarily achieve GM2.

For Classic, I'm pretty sure that every GM3 can achieve GM2 unless they really don't play TAP. I mean, in theory they have different skills and it's possible, but in practice, given how incredibly fucking hard it is to get GM on Ti, they can.

And for World sure they can't but that's because World TGM is vastly easier than Classic TGM, and TAP doesn't have World rotation.

And how do we succinctly distinguish between world grades and classic grades.

Ignore World grades (at the moment). Only a ridiculously tiny number of people actually take it seriously, and of the ones that do most play Classic and would probably prefer to be seen as a Classic player. If that changes then sure, think about it then, but at the moment World has a pretty low status.

TAP(aka TGM2)

Just to be nitpicky, TAP is TGM2+, and is distinctly different from what people usually mean when they say "TGM2".

Though actually, on reflection, I disagree with most of your post bigwig. You're trying to assign an arbitrary points system to a game which already has pretty clearly defined grades. Why condense stuff down into GM2+ (which is somewhat meaningless) rather than just list the achievements separately. Five modes don't generate a particularly long list, and IMO you can't just lump TA/Ti Master, Death and Shirase into the same points system because they're not directly comparable. Plus you're completely ignoring time (Sub 8 minute TAP Gm or sub 9-minute TGM1 Gm is a way bigger deal than just Death Gm).

SRS games don't have a grading system that factors speed and VS skills across the board. ARS games already have one, and it seems silly to me to go about creating another one. Especially if it's not just going to be on a scale of 1-10 like the SRS one.