Its not just about 'being second'. You could finish 2nd 15 points off the pace, however finishing 2nd, 2 points off the pace with an 89 points total is an indication we are knocking on the door in regard to the league title. Especially with a goal differential of 62+ which is a massive number.
Im sure Man United want to win the PL again, however before you win it again, you will need to have a season where you finish above atleast 80 points minimum. You wont go from a point tally of 60 with a negative goal difference to winning the league without fixing some of the underlying issues in your sqaud and club.
I know this, because when we won the FA Cup and finished 8th, it did nothing to turbo charge us up the league. We went up the league table when we binned the likes of Aubamayang and other high earners who thought they were doing the club a favour in playing for us. We went up the league table after a few robust transfer windows and development of younger players.
Dont let the FA Cup win fool oyu into thinking ETH has it all under control - he has mountains to move to get Man United competing for the league again. And there are some who think United wont compete under ETH due to evidence of poor recruitment and an inability to develop a style of play.