That's a 15 year old TV at least and of course you don't see a difference on that. My 4k is at least 6 years old. If I bought one now I would not be able to buy lower res.

DVD is pal or ntsc and if you played that on a monitor the picture is as small as phone. It's like the lowest SVGA res

I found out the hard way that 4k Blu-ray need a special player. That it won't work on Ps2/PS3/PS4 I already have. Only "regular blue-ray play on those.

Distance and size makes the most difference.

If you're sitting ~7' back from a 50" TV it really doesn't matter if it's 720, 1080, 4k, or 8k.

You have to be right up on it to tell or have a huge screen.

Nicer TVs do have better color and contrast that you can tell from any distance. But generally you have to have something to compare it to for it to really matter. Dark scenes on a poor quality TV can look awful.

Heck CRTs were standard at 480p and nobody had any problems

Dvd video on a cell phone looks great

Way too many DVDs are interlaced/telecined though.

Or worse, some hellish combination of both, because the producers edited different sources together. It makes scaled footage, panning, and some motion look really awful or jittery once you notice it.

Blu rays don't necessarily escape this either, as they butcher the conversion to 24p and then you can't even fix it.

For all their problems, streaming giants usual do this better. Amazon (and probably Netflix) had employees hanging out in the doom9 A/V forums long ago.