Comment by JuniperMesos

> That said, 70% of our users haven't got the memo yet - we'll do a hard-upgrade when the remaining missing features in Element X (Spaces & Threads) are fully out of Labs.

This isn't users not getting the memo yet, this is users being faced with an unfortunate choice between a buggy, slow client and a new client that doesn't implement important functionality like Spaces and Threads.