Yes, it is still possible they'll do something drastic in the final release. Assuming the final product is even roughly similar to the playtests, it'll be fine, though.
The idea that a named player-facing rules element needs to be identical for everyone playing is a pernicious myth that needs to die. 5e is about exception-based design. Every character can be its own exception. If player A uses a bespoke rules element that's been approved by the DM, then player B's familiarity with the rule is immaterial. You don't need to police other people's characters. You do your thing, the other player does their thing, and as long as the DM is good, it doesn't matter.
I know food metaphors always work wonderfully and never blow up in my face, so here we go.
If I order the cheeseburger and fries, and you also order the cheeseburger and fries, but swap out the beef patty for chicken, hold the tomatoes, add horseradish aioli, and have broccoli instead of fries, you aren't hurting my meal in any way. The DM is paying and picked the restaurant, but as long as your order isn't too expensive, why would the DM care?
Granted, if the DM is having a house party the menu might be more limited, but most games are at "restaurants".