Welcome, from a fellow American.
You post on Spurs' reddit by any chance? Your thoughts seem to be the general consensus from over there.
We can ignore the talk of another midfielder all we like, but the fact is our manager rather clearly wants this move, so I do think it's reasonable we discuss why.
As for my own stance, we have done far too much slow, horizontal passing from the midfield the last two years. Far, far too much of it. Aside from Bentaleb at 28, none of our other midfielders averaged more than 24 forward passes per game. Schneiderlin averaged a whopping 37 forward passes per game, as well as led the league in tackles and interceptions. He also knows Poch's unusual tactics well, so could help make the transition time much shorter considering Schneiderlin himself said it took Saints six months to fully implement his ideas. As we saw in the game yesterday, we still have problems with adequately closing on the ball in midfield to prevent dangerous situations from developing further into our own half. Schneiderlin, with his rate of tackles and interceptions, rather clearly would be an upgrade in preventing these situations.
So to these eyes, I can see why Poch would want such a move. Quantity is never a reason not to pursue quality.