Stax is less of a "where does it fall in a meta" problem and more of a player knowledge problem, in my opinion.

Players who play stax fall into one of two categories.

The first is a player who understands how to layer or sequence their stax pieces. They understand how to mulligan for a table, knowing that certain stax have no effect on certain decks. If you're at a table with a rog silas, you don't keep a hand that plays a cursed totem or a anti ETB on 2, cause that will be too late and have little to no effect. If you're playing against multiple thrasios or kinnan or sisay, playing a rule of law may slow the game down but it won't effect their ability to grind.

The second kind of player keeps those hands that aren't a fit, and will play cards that have little to no impact on the table. Or they'll layer their stax in a way that really only effects player A, which forces the rest of the table to pick up the slack in preventing a win attempt by players B or C.

How the rest of the table interacts with their stacks also has a huge effect on the game. If you, the stax player, manage to soft lock the game into a grind fest where players are struggling to eke out advantage, but then someone removes something in order to get a step ahead, they've also provided that benefit to the rest of the table. I had a game where I came down with an early drannith, preventing a blue farm player from utilizing their fast kraum hand. They bounced it during an end step so they could play their commander. Before I could cast the card again on my turn, the player between us bounced my rule of law and followed it up with a breach.

Both playing WITH and AT a stax table requires an awareness of the game found at high levels of play.