For people who only like modern mainstream stuff, DVDs are no longer relevant. For everyone else, DVDs are still a thing. I don't think DVD players need to be shipped with a computer anymore as most people are fine with streaming media or getting digital copies.
I bought a DVD burner because I like vintage movies. I do convert them into digital format because it's more convenient and I'd like to archive my stuff. If you do like vintage and rare stuff, CDs and DVDs are very much a thing because most of that is NOT available via streaming services. The streaming libraries are still very limited and feature mostly popular mainstream media. I've yet to find a service, video or audio, that offers anything out of the ordinary and thus, thank goodness we can still buy optical drives, at least until every publisher hops on the bandwagon and the majority of media is released and made available in digital format. That time is not now. Not by a long shot.