Don't we all have our ever changing list of favorite items? Items that vanish from stores and we "ugh and sigh" at their loss and then buckle down to search for a replacement. No, you're correct, they don't always disappear, but we notice when they do.
Soap for instance: I prefer liquid soap over bar soap in the shower. Who knows why or when this occurred, but it's one of the items I've had to search for and replace. One brand that I recall, was Nature's Gate. They sold their company, but prior to the switch, they removed several items from their offerings--choosing to focus on shampoo and conditioner. Oh! And the same thing happened with Aubrey Organics. The latest fav soap, that appears to be gone, is EO Products', Vetiver and Coconut. It took me some time to get used to the scent, but now it's all I want. It's never a good sign, when you spot online folks selling lots of four of your fav scent.
On the other hand, I can remember becoming a Paula Begoun fan back in the 80's. She was a regular guest on a morning show I watched most weekdays. Eventually, in the mid-nineties, she began her own cosmetics company in Seattle. Which led to me using her shampoo and conditioner for over twenty years. When you find something you like and need (unscented), you stick with it. (Did a search to check when she started, and learned she sold her company seven years ago. Now K is bummed.)
So, it's decision time once again, in the soap department. And I'm considering staying with the same brand and settling for one of the other scents. Settling--did not like typing that word, but there it is. It's not that big of a deal, K, plus--a good search takes time and you've got that.