Just my personal experience that as my obsession with Chanel went down, I started buying other luxury brands. It seems like other brands like Dior's Lady Dior and Caro bags, and the Fendi exotic peekaboos and Fendi first clutches are more scarce and aesthetically pleasing than Chanel's seasonal bags. As soon as Chanel's seasonal bags are released, you will find 5 bags sold to FP. I remember the caramel 19, FP had so many of those at one point as well as the iridescent bags. I hardly see a Fendi first clutch being sold in there or an exotic peekaboo. So my theory is these ultra wealthy are bored and turned off with Chanel because you can easily buy a classic flap online whenever you want to, it's not really that scarce anymore. A friend of mine just told me that her store in Cali had a lot of black classic flaps available.
Ah interesting, I guess you and I have a bit of different experience. I don't know too much about Fendi but I do love Dior. I recently started getting into Chanel. I love the Fendi peekaboo but haven't bought one yet... the resale value of the peekaboo is fairly low so I might end up getting one pre-loved. The Fendi First is a unique bag but it looks a bit too trendy for my taste and seems difficult to use in daily life (at least my daily lifestyle).
This is based off my late 2021/early 2022 experience but it's been pretty hard getting caviar classic flaps in small or medium. I had to wait about a month recently to get a black classic flap in GHW and the 3 stores I hit up in the US Northeast only had a handful of various classic flaps in store. Every store is essentially out of stock of almost all SLGs.
On the other hand, I shop at Dior often and I love Dior. Unless you're buying a limited edition Lady Dior, everything else is pretty simple to get and can usually get it on the spot. I've bought a saddle and 2 lady diors recently and they always have tons of stock in various colors. Off topic but I just bought the navy blue wicker lady dior and I can't wait to use it.