KairuSideshowThe widowmaker really isn't a straight upgrade. Whenever it's considered here, there is always this argument made that "in the right hands it's unstoppable". I personally have never seen it in the right hands; every player misses a few shots and as an engineer your metal is so vital you're stumped as soon as you miss. Even if you do hit everything, the only bonus is not having to reload. It's not that big a deal - even if it Sounds great when you theorycraft, it doesn't make a jot of difference in an actual game, just makes engi slightly more fun to play aggressively.
I don't see why anyone would ever run non-widowmaker in a 6s last hold setting.
you forget that part of the reason to run engi over heavy is you get a damage sponge while also having a slow scout.
i have played lasts with the widowmaker on process, and it's really irritating to not be able to pop into lobby to finish off a scout because i'm scared i'll miss. similarly with spamming out people on badlands last's main or right.
using the widowmaker means if your sentry is up you are discouraged from shooting anything, and once your sentry is down it doesn't give you enough of a boost where engie becomes an effective DM class. without a sentry, you're not gonna have time to empty your clip.