As such, I believe there should not be such a thing as RT, and all RT games should come with pausability.
Real Time games are real-times games, because timed physical imput is core part of gamplay design.
This is not at all true for all RT games. Witcher 3 is a RT game, but has no timed physical input as a core part of its gameplay. The only timed inputs are in dialogue choices, not at all in combat. If that game had included pausing during combat, nothing would've been lost or changed in terms of gameplay. Yes one could argue it didn't need pausing in combat, and that is fine as an argument, but the core mechanics of the game would not in any way have been adversely affected by including pausing.