[stakkur]

There are many guitar 'tunings', and many predate the 'standard' tuning the article refers to. Also, players make up different ones all the time, including using capos to temporarily change 'tuning' on the fly. The 'standard' tuning is by no means the only one.

[wilsonnb3]

Yeah but it’s called standard for a reason, probably like 80% or more of guitar music uses it.

Include a few other tunings (drop d and below, dadgad, the more popular open tunings) and you can bump that up to 99%.