Our fans don't understand how close we are to actually being a potentially great team.
We have regularly high performing talent ( Casemiro, Licha, Varane, Shaw, Bruno, and Rashford).
Casemiro may be the best performing DM in the world. The media and our fans won't want to admit this quite yet but Licha may be the best centre back in the league. Shaw, Bruno, Rashford and Varane are performing at such a high level that each can be considered top 5 players in their positions currently in the world. We also have other players like Eriksen, Dalot, DDG, Antony, Sancho and AWB who are good performers.
The problem we have are that despite the quality we have as a whole, we have massive gaps in depth and in key positions. This gap is what separates dominant teams from league challenging teams. I think currently we have the quality to competitively challenge for the league, but lack certain assets to actually win it, particularly given the high standard of the league at the moment.
Arsenal would not have won the leagues they won if an aging CR7 and a talent like Weighorst were leading their frontline for most of the season. United from 04-06 struggled for consistency due to having to consistenly use Silvestre, Brown and O'shea in their defence during that period. Our lack of depth at striker in 04-05 led to United scoring as low as 58 goals that season, simply on the basis of swapping Van Nistelrooy for Alan Smith.
When Arsenal won their leagues, they had period's where the likes of Vieira, Henry and Pires went down due to injuries, yet they could cope because they already had solid partners and their replacements, Edu, Wiltord, Kanu etc were really good technical players. For United, both from 99-03 and from 07-09, the same rings true. We could lose Yorke or Cole and replace them with Solksjaer or Sheringham. We could temporarily replace Giggs or Beckham with Bloemquist or Ole. Nicky Butt could come in for Keane or Scholes. Fletcher or Anderson could come in for Carrick or Scholes. Park or Nani ccould come in for Giggs or Ronaldo. And in attack, we had Tevez/Saha/Ole/Larsson backing up at times, whilst also enjoying the versatility of Rooney, Ronaldo and Giggs.
My point here is that in order to ensure consistent performances/ results, you need consistently good players at all times, in every position. At United currently, we've had Fred and Mctominay start lots of games ( both of whom might struggle getting gametime at a club like Leeds), a right flank where our starting player (Antony) is still clearly finding himself whilst all his alternatives are too young or haven't established themselves as right wingers and in attack neither of our strikers may be starting level strikers for a league winning team. Martial hasn't shown fitness or consistency and Wout may not belong at Premier League level.