I don't watch Mbappe week in week out, so can't say definitively that he'll never be worth (in purely footballing terms) 250 mill or whatever, but right now he's not imo, and nor is Neymar, at least on last night's evidence. So yeah, I tend to agree that the money tied up in those two, and ignoring for one moment Psg's nightmare transfer policy in recent years, could be better spent, or at least more effectively spent.
Like I say, I don't watch them regularly, but as a team (and maybe they'll prove me wrong) they look miles off the champions league. They've had the same bang average full backs for what seems an eternity, their best def is old and their only other good one often plays def mid (and the money spent on that Keher and Diallo, wtf?), they've stockpiled dross in midfield while failing to replace Motta\complement Veratti, and now put Mbappe up front while a pudgy Neymar sits deep and fails to take advantage of the other's only stand out attribute, his pace.
Overall it's all a bit of a fiasco, but unlike most on here I take no pleasure from this and am merely disappointed from an aesthetic perspective, in that the more good footballing teams the better imo. Hopefully Psg will improve at home. Hopefully a different formation too, because my god when your only width is Kurzawa and Meunier, and you've got freaking Gueye in mid and a spoilt kid failing to link the play in any meaningful way (though nice assist; which is doubly annoying in a way because it was so easy, Dortmund themselves being joke bad defensively, so why play so passively, so negatively?), you're in trouble.
Ps - I am aware they don't normally play 343, so maybe Tuchel just bottled it and will rectify his mistake, we shall see. Either way the squad is still horribly unbalanced, and if it was Leonardo was responsible for recent recruitment he needs to go the way of that comically inept director whose name escapes me.