This is rather misleading, the FLP theorem talks about fully asynchronous networks with unbounded delay. Partial synchrony is a perfectly reasonable assumption and allows atomic broadcast and locking to work perfectly well even if there is an unknown but finite bound on network delay.
Atomic Broadcast (via Paxos or RAFT) does not depend on partial synchrony assumptions to maintain its safety properties.
Your internet or intranet networks are definitely asynchronous and assuming delays are bound is a recipe for building crappy systems that will inevitably fail on you in hard to debug ways.
