Personally, I got my Croisette when it was first released (Azur with rb lining) and still love it as much! Therefore I might be biased. I love the shape and would classify it as classic for the following reasons:
-top handle bag
-flap bag
-crossbody option with the strap which is fully removable
-classic pattern for LV, nothing too flashy or modern like those extra LV's on some camera bags
-all "trendy" features are removable --> tassel, I removed it almost right after I bought the bag.
It looks feminine and is well suited for day and night times.The Croisette fits a full size wallet, key cles, phone and mini pochette. Back in 2017 it was a no brainer for me as I fell for the bag and to this day I haven't regretted it. It's my perfect little summer bag.
AndI would give it one bonus point: it's spotted less often than many other bags which makes it a tiny tad more special to me (still love my Neverfull though).
Regarding the popularity: I guess LV wouldn't keep producing it if it weren't popular. They stopped so many designs after one season and the Croisette has been available for over three years now. They even just released the Croisette Chain which leads me to belief the design is popular enough.
Btw, I almost bought it in the damier ebene, too! I really really miss the bag once the temperatures get colder and would love a winter version. However, I do not buy duplicate bags, thus I am searching for an alternative and couldn't find one to match to this day