I didn't know the manufacturers were doing this, but I too am not surprised. It's funny too, because the cheaper manufacturing costs of doing it this way are not reflected in the price to the consumer. I've been shopping for drives this weekend, and I see that external drives with their included enclosures are often as much as $100 more than their bare counterparts.
Like others here, I only buy internal bare drives (probably for the last 8-10 years), and either install them internally (*) or I put them into a USB enclosure. About a year ago, I bought several enclosures of the "Inatek" brand (I think they might be Amazon's "house brand"), and they've been just fine. The small enclousures are tool-less for 2.5" drives, and the big enclosures require a screwdriver, but they're metal and can accept either a 3.5" or 2.5" drive.
(*) I'm not ready to go to "drive sticks", as I call them (the laptop is too old and on the new desktop motherboard, I didn't want to give up the PCI performance on those slots), but I have mostly transitioned to using 2.5" SSDs; even in my full tower, and will probably remove the last 3.5" data drive sometime in the next year. Once that happens, my use of 3.5" drives will be relegated to use for Macrium backups or my NAS cloud, and all my OS, application, and data on any of my machines will be served by laptop SSDs.
Another issue is that with the size of my audio VST sample files, and the quantity of data I back up, I don't accept HDDs with spindle speeds lower than 7200 RPM. And manufacturers are not making those as much anymore. So if I'm buying a 2.5" drive, it pretty much must be an SSD.