No doubt Mbappe is at the moment, but it is obvious it was still inflated at the time. I don't think Felix has shown any more than Sancho and Havertz (there are some others as yet Felix seems to be the only one being touted at £100m. He looks a good player, but I th well),ink it is too soon to spend that amount.
Barcelona have gone a bit mad with some of their signings. 108m starting fee (rising to 135m) for Dembele based on one season was insane, and he certainly hasn't shown he is worth anywhere near that at the moment.
I think the transfer fee was more understandable for Coutinho based on his Liverpool performances, especially being on more than one season. However, it was also overpriced as they seemed strangely desperate to sign him in the January window.
I just still think it is generally seen as overpriced to spend £100m on a relevantly unknown commodity. I mean Real Madrid have just signed Jovic for £57m, a guy who scored 27 goals at the age of 21. Is Felix really worth almost twice as much?