17/18 and 18/19 were really the only two years they were that great IMO.
I think if anyone other than MAF was in the net for Vegas in 17/18, Winnipeg would have been in the Cup finals. They were a very, very good team. They had great depth, and some of their best players were guys still on their ELC. So they could afford to add a Stastny at the deadline and push Brian Little down to 3rd line.
Way too much turnover on the D basically crushed this team. Wasn't it 4 or 5 that left (retirement, UFA, trade) after 17/18? You simply can't recover from that.
As others have alluded to as well, winning the Stanley Cup is extremely difficult, no matter how good you are. Just look at the 22/23 Boston Bruins for proof of that.