I see your hyperbole with your 'well we can't be Barcelona because of' blah blah and simply say 'Leicester' as a counter and say "Why yes, we COULD play like Leicester'. People said 'we'd be the narrowest team in the league' and you mentioned a team that did it with two players far beyond what Tom cleverly is. It's called "like for like", not mention a far superior team that nearly won the champions league and say 'see? We can do it with Tom cleverly!' 4-2-3-1 and 4-3-3 are known formations. Having literally no width strains even the most imaginative iteration of what we could achieve, no?
You're confusing tactics and formation.
Could we play with the same tactics as Juve? Didn't watch them loads other than the CL games, but I'm guessing without the individual brilliance of your Pogba's and Pirlo's, then the answer would probably be no.
Likewise, could we play with the pressing and counter attacking style of Leicester? Nope, we don't have players with the energy of Vardy, Drinkwater, Kante, Albrighton et al. to pressure the opposition for 90 minutes.
Could we play a 4-4-2 like thm? Impossible to know until we've tried it, but we've got 3 strikers, plenty of wide players and centre mids who can run a game.
The Leicester example is a strange one though, with 4-4-2 being basically defunct unless you have a very specific type of player