I ordered two bags "to make 5 liters" as soon as I determined Xtol produced results I like (several months ago -- takes a while to get through five liters at 70ml replenishment per roll). Both bags are 2020/02/27 date code. I just sent an email.
At present, I have no plans to abandon Xtol, but if the time comes when I must, I'll mix my own -- either D-23 with DK-25 replenisher, or D-76 and D-76R. Having started replenishment, I find i quite like it. I find one-shot film developers (other than high dilution types like Rodinal derivatives) wasteful, and limited reuse with extended time is asking for mistakes -- at the least, missing recording a processing run and underdeveloping all following films in the same developer batch.