>a studio instead takes an old game that used to be popular, slightly updates graphics

That's not a remake, that's a remaster.

A remaster is adding high res textures and upscaling the resolution and such.

A remake is entirely rebuilding the game from the ground up, from scratch. FF7 remake was rebuilt from scratch. Dead space was rebuilt from scratch. Skyrim was remastered.

You aren't understanding the difference between the two. It's a big difference.