SCSI2SD has just a little bit of a pass because it has extensive non-Mac and even not-strictly-computing applications. I'm told by inertialcomputing that they sell very well for users of certain musical instruments that use SCSI storage for data, for example.
However, it's worth noting that as a community we should not be trashing efforts to build new peripherals. As Gorgonops says, it's childish.
I've always insisted the SCSI2SD was an overpriced piece of garbage, much to the opposition of other folks too wimpy to use real hard drives. Sure it gives you a SCSI disk using an SD card but that's about it and skill wise it's prohibitive for the average person to assemble because of the number of SMD components. Also there was likely going to be better solutions. Something smaller but much more feature packed. Something to tell the SCSI2SD to get bent.
Let's just face the facts here. Not all Mac users and even not all vintage Mac enthusiasts even have the wherewithal to solder things. It's why recapping services have some success, and it's one of the reasons I personally drop hints to people who show that they can do it that they might be able to make a few extra dollars on the side. (PM wthww, Bunsen, and/or me if you want to have a stickied topic in the trading post as a vendor!)
Plus, I think that the idea that somehow using a spinning disk makes you better, more courageous, more manly, or whatever, is pretty ridiculous, and perhaps even toxic, as though there's a right way to enjoy these older systems. As hard disks themselves, never the most durable part of a vintage Mac, become harder and harder to find, and as systems become harder to find, we as a community need to adapt to the fact that one day, Performa 475s with SCSI2SDs will be a much more reasonable and attainable way to enjoy vintage mac software than Quadra 950s and almost any kind of spinning disk.
I don't think spinning hard disks will completely go away in the next couple of years, but it's already to the point where for somebody with literally any ability to set aside for a new piece of hardware should easily be able to get an SCSI2SD v5 or v6 (depending on their needs) and will have a fast (certainly 'good enough' at the very least) and capacious storage option.
To me, it seems a little better than bothering with SCA or other uscsi adapters and then playing the "is this particular disk still working well enough to be worthwhile?" game. Others will make different evaluations and that's perfectly fine.
You're free not to want to use the SCSI2SD yourself, but it effectively solves a problem that users of computers with SCSI have started to have for a few years ago. That problem will not go away, even if you hoard drives.