What are you talking about blurry? Upscaled DVD is perfectly fine. For most movies from the 80s and 90s it's not like you're going to notice a difference going to Blu Ray or UHD streaming.
Complete crock of shit. Movies from the 80s and 90s were usually shot on 35mm - DVD quality does not begin to extract the detail nor the dynamic range in these films.
It’s not a subtle difference.
And if bitstarving is an issue it’s usually going to be DVD. No amount of encoder magic can overcome MPEG-2 inherent shortcomings.
Just getting rid of interlacing makes any upgrade from DVDs worth it IMO.
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.
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.