For me, if you have to have digital tools to play it’s an overly complex and crunchy game. That said, the “necessity” of the online tools for 4E is somewhat overblown.
Right, I played 4E not using anything electronic and assume others did to. The 4E thing made me think of the question, but I apologize for not making it clear I was not meaning to imply 4E wasn't a ttRPG.
If I run or play Rime of the Frost Maiden using Fantasy Grounds, does it stop being a TTRPG experience?
Does a median DM and set of players need to use a computer screen and computer calculations to run it? Or is it also doable with say miniatures and/or theater of the mind and/or sketching things out on paper when needed?
If typical groups need a computer to do something passably, it feels to me like it at some point it has stopped being a ttRPG. I just don't know where that is.
The example above of a phone app to do wierd RNG doesn't seem disqualifying of being a ttRPG to me. (I can imagine a game in the 80s being packaged with a little thing you could push a button on to get the RNG having been a thing).