So a funny thing happened to me a while ago... I built my current PC, about 3 years ago (an AMD 7700X but whatever). At some point I wanted to check some old data DVDs I burned, maybe one year after I built the PC or something: basically to make sure everything on the data DVDs was safely backed up in other places...

So I dug out an old internal DVD reader/burner (still have a few of those) only to notice that: my PC tower didn't physically allow to insert an internal CD/DVD reader. I hadn't realized until then. At first I tried to push on the front panel, thinking maybe it was going to open entirely. So I went on IRC, in a good old famous channel, to vent a bit. And they told me it was a thing: new PC towers with a slot of a CD/DVD reader are really uncommon now.

I literally didn't notice until I actually tried, after a year or so, to put a reader in the PC.

Now of course I had plenty other options: using another tower, my server (a Xeon workstation) has got a CD/DVD reader, I could ghetto-mount the internal reader temporarily while letting the tower opened, etc.

But that's not the point: internal CD/DVD readers/burners kinda went away, silently, with some of us not even noticing that PC towers suddenly didn't even offer the physical possibility to install them.