Why aren't TTRPGS more like Paper Mario + Granular Damage Upgrades

When it comes to TTRPGs and their video game cousins, the obvious D&D inspired games come to mind first. But one thing I find weird is the seeming rarity and lack of "very low number" games. Paper Mario & Thousand Year Door are the most prominent; along with their more modern offspring like Bug Fables. Specifically; games with turn based combat, small scale battles with few characters or units,…