A thumb drive is much better, as long as it not one of those thumb drives that's barely bigger than a USB port. But for offline storage that can be easily filed into a cabinet and paged through, floppy disks really were a great size. You can't file thumb drives; they're too narrow and thick, so a collection of them just ends up being a pile.
It's really too bad we don't have some kind of inexpensive, high-reliability, high-density offline storage format that resembles 3.5" floppies.
I know modern devices don't have a lot of space, but regular SD cards and mini-SIMs weren't really that big. (The full credit card sized original SIM card size is dramatically oversized though)
This is true, but the idea is that you should almost never need to do this. It should be a rare occasion when you need to install or remove a microSD card. It's just like nanoSIM cards: when was the last time you needed to swap that out?
Floppy disks, and today USB thumb drives, serve a different purpose: they're supposed to be easy to plug and unplug and move data around. I don't see microSD cards as having that purpose at all. I have a microSD card in my phone, and it's great, but I haven't taken it out since I put it in there several years ago; it's just a storage expansion device, not a way of easily moving data between devices. It's not that easy to swap between devices, but it's easy enough to do, with some care, for those rare occasions it might be necessary (like migrating to a new phone).
You'd really think that Sony would have figured out that every single storage medium they've ever made has been an utter failure, but Sony is gonna Sony.
Also Sony: No, not like that.
Sony's positioning in storage formats is just weird. They spend untold money developing media formats intending to recoup the development costs licensing those formats. Then make the licensing fees and conditions so onerous that no one is willing to license them. The only time anyone touches a Sony influenced format is when it's developed and licensed by a consortium.
Case in point: Vita Memory Card. Superficially similar to Micro SD, and it even uses a similar electrical protocol... but it isn't compatible.
It reminds me a lot of IBM when they introduced the PS/2 computers. They really, really thought that they could single-handedly kill all the PC "clones" by pushing their clunky, overpriced PC with a bunch of proprietary standards in it (namely the MCA bus). The people running these two companies had an extreme amount of arrogance and hubris.
This is a little funny in a thread about floppy disks, considering that the extremely popular and ubiquitous 3.5” Micro Floppy Disk was a Sony design ;)
There are also some other Sony formats that actually stuck, like DAT, Minidisc (yes, not so much in the US from what I gather, but it was A Thing in Europe, Australia and Japan) and Betacam.
These cards are much sturdier than the SD cards, and much faster, due to the PCIe interface. If a laptop had a slot for them, they would have been much more convenient than external SSDs or USB drives, which protrude from the case or are hanging on cables.