What have likes of Tuchel or Nagglesman done to be seen as top coaches?
Xavi is the obvious choice to give a chance to dur to his understanding of the club and how he wants game to be played.
There is not the clamour of top coaches to move to Spain and coach Barca anyway would be my guess and outwith Pep/Klopp not sure who would be seen as very top anyway.
Top proven coaches chose jobs wisely and now nor past few years would not be a good time for any of them to arrived.... and most want to be in EPL if can get there.
What have we seen with Nagelsmann? He has managed to increase the level of multiple players in two separate clubs now, in Hoffenheim and Leipzig. We have multiple players who first blossomed under his tenures, from Gnabry to one season wonders like Joelinton. There is a clear "before and after" with Nagelsmann's teams, where after his appointment you can see a clear evolution of style in a short period of time coupled with better results at a consistent rate. He is no Ancelotti, Zidane, Mourinho, or whatever, but it is clear he is one of the best young managers in football.
Tuchel is even easier. Played some of the best football in Dortmund 16-17, known for elevating players in Germany as well, reached UCL finals, and has a respectable trophy cabinet.
I'm not saying these guys arent risks, but they do have a recent record of building teams, playing good football, achieving consistent good results at the highest level, and developing youth. Who knows, they might totally flop but they are for sure better choices than Xavi at the moment simply based on their resumes.