Bill Zebub
“It’s probably Matt Mercer’s fault.”
Players IME are not inclined to intentionally take a weaker option. The playtest druid is garbage compared to the 2014 one, and I would feel dirty as a DM insisting on it.
But why would that even be an issue? Why would you...or anybody...possibly ever insist that a player use a prototype class from a playtest document? I mean, unless you were specifically playtesting?