Once again a thread about second guessing a "what if" pilot decision.
What condition the engine is found after landing has no bearing on a decison while in the air.
The crew is provided with engine symptoms in the air, SOPs and room for weighing alternatives (judgemental).
The decision to land and when and where should consider the crew work load, (opportunity for errors) versus the performamnce degardation of the aircraft.
Having had an engine annomaly with vibration that is controllable by retarding the throttle still provides redundancy in systems as well as a potential thrust redundancy in an emergency.
Landing at unfamilar airports (charts, protocols etc.) vs a more comfortable alternate simply is part of the flexibility in judgement in-the-air (not hind sight on-the-ground)