It's not hindsight at all. A lot of the players outperformed Pereira last season. Rothwell, Pearson, Wilson, Janko, Charni, etc... Obviously Pereira has more technical ability and a higher potential than the names listed, but playing behind the striker he wasn't creative enough, and didn't cause the defenses all that much trouble. Whenever he had the ball in the final third, he would usually only look to create an opening for himself. The attack as a whole was awful for the reserve team so it might be harsh on him, but it would have been worse if not for the finishing of Wilson and the drive of Rothwell.
This is all based on last season which I watched every one of his matches. 99corrigan also makes numerous videos of his performances even when other players outperformed him. No one is writing him off here. He's still really young and can obviously develop into a fantastic player. But you can't tell me Pogba at the same age wasn't putting in better performances or showing more than him. I can't even think of one performance at the u18 or u21 level (this past season) where Pereira put in a performance as good as Pogba did in the 2nd leg of the FA Youth Cup final.
And again, I was one of the people who also thought Januzaj was ready for the first team. I just wasn't on the forum at the time.
Although I think Pereira will not end up playing behind the striker and instead deeper, the comparison wasn't about who was the better midfielder (midfield 2). The comparison was in terms of consistency. I think Pogba's best bits of play were a level above Pereira's.
If you want to compare him to another attacking midfielder, then you can compare him to Januzaj although that would be unfair on him.