Most people quit within a lesson or so, others within a year.
The hype surrounding modern tai chi leads new starters to have high ambitions and low commitment.

For some inexplicable reason new starters forget that using the body for hours at a time requires strength.
Combat necessitates concentration and stamina.

It is common to see new starters gasping for breath minutes after a melee exercise commences.
Their minds are reeling in confusion.
They are not breathing properly.
They are incredibly unfit.
Unprepared.

And yet these same people wonder why they are not being shown advanced-level skills...