Are DIMMs (a.k.a. UDIMM) still a thing?

I would think most servers and workstations would be RDIMM (Registered DIMM) by now and consumer stuff uses soldered down memory. Memory failing because it's old is definitely a thing, and very possible in this scenario, but I feel like I haven't seen errors due to physical insertion, that were not caught immediately by POST, in years.

But maybe it's just me. Happy to be lucky. :)