Many plans I've participated in cap contributions well before the theoretical 25k limit. Current employer has a very interesting plan that leaves much of the limits up to you which is a double edged sword. If you can figure out how to model the limit, you can make informed decisions when the price falls but for the average employee it's complicated and can cap their contributions way too early.
To effectively figure out the 25k limit you need a history of prior contributions to know how much limit is left in each tax/calendar year.
To effectively figure out the 25k limit you need a history of prior contributions to know how much limit is left in each tax/calendar year.