It kind of depends where you start from I guess. As I understand it, Tuchel had a huge advantage in that Lampard was already coaching high press, albeit not very well. We have a number of very highly paid players who look like they would be terrible at playing a Genenpress. Ronaldo, Maguire, De Gea, Pogba to pick the most obvious ones. So we have a lot more work to do. And getting players of that quality who can also press is a lot harder than getting mid table players. Are the Glazers likely to fund this? Did they realise a load of squad surgery would be necessary when bringing in Ralf? I doubt it.
Maybe I'm wrong and Ronaldo and De Gea will transform their games. But I don't think so.