Yeah, plenty of interfaces out there that are laggy from the start and no payouts there. However, if the interface does become completely unresponsive or crashes regularly, that still is a safety issue.
Just so people can see what to expect from a settlement of sorts, here's how the payoff was handle for Ford's system:
"Claim amounts will vary depending on owners’ experiences with the systems. The settlement stipulates that customers who had their multimedia system repaired once at the dealership can file a claim for $100. For two repair visits, that number jumps to $250, and those who brought their vehicle in for system repairs three or more times can file for $400. Even if you didn’t visit the dealership for a fix, however, affected owners can still file a claim for $45."
MyFord Touch, MyLincoln Touch lawsuit: $400 to some Ford, Lincoln owners
I don't think a free MCU2 is coming based on that. Most likely it'll be more proactive eMMC replacement and software updates to reduce the bloat. For those who bought FSD, perhaps they might get a bit more if MCU1 really does end up not usable with it.