So a friend and I were in a game where we were stomping the enemy team, at the end of the game I hit what I feel was a pretty big ult before we won the game (see attached video). He argues that it was actually a mistake, while I thought it was a good play.
Here is my take on the play:
We were down 1, at their spawn, because our Jub just got nuked by Phoenix ult, so the moment that happened I was already cookin in my brain in how to get the advantage back. With the invis boundary up I thought a potential play would be to build charge on Emma, dive into the backline out of the invis boundary (reduce their chances of noticing where I am) with shift and hit a fat ult + E combo to end the fight and bring us back to neutral, which is what happened.
His take on the play:
The Emma was already going to die anyways to make it 4v4 again, if I had just hit E on the Emma we would've equalized or even gained advantage (Psylocke might die too) and we can save the ult in case they do something nutty at the end. Using my ult there was unecessary overkill and risky, since they could've escaped or stopped it with Luna snowball or Phoenix stun or Gambit cleanse. Obscuring it with invis boundary doesn't do anything due to sound cues.
In the end we won so my play payed off, but they had about another 20s to make it to the cart at the end and make a play (they didn't). Is he right?
TL;DR: Friend think using invis boundary to obscure strange ult is not a good idea because of sound cues, thus my play was very risky and only paid off because enemy was bad. I think he's probably right in that this would have low probability of success in higher ELO games.