It's playable as long as you enjoy it, if you started to feel like it's kinda dryish maybe try some other mainline opening they are honestly more fun to indulge in and positions are very lively especially at our level.
At what rating does it become unreliable to play the Vienna (specifically 3.f4)
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oh right, how are early Nc3 lines also always objectively better (as you say)
what about playing Nc3 makes it better, and why cant you get it