Speak for yourself. Upscaling a DVD to a 4k large TV looks tremendously bad unless you're doing it with specialized software with some format-aware intelligence in it. So you need a computer hooked to your TV.

There's plenty of bitrate starved streaming content that's available on streaming that's poorly upscaled from a DVD, but that's not the case on studio upscale Blu-Rays with extremely plentiful bitrates and sometimes even film re-scans resulting in a quality that was better than what you could even get in the theater from the original film stock.

A bluray won't be bit-starved.

UHD streaming, even if it is bit-starved, should be far ahead of a DVD. HD content that is bit-starved is more of a tossup, but I rarely see egregious behavior even from youtube's bad bitrates. I only see that on overcompressed television stations.