My reason for not wanting a parser is probably a bit selfish but I'll share it anyway. I don't want it for the simple fact that it'll cause me to get tunnel vision. Even if I could turn it off I'd have that nagging feeling it was there, and I wouldn't be able to resist. It would lower my enjoyment of the game. I was so relieved when I saw that there wasn't a parser in this game.
I try to do my very best in every content I do. I look up tutorials and read guides. That is my choice though and I don't want to push others to do the same. Even if it does frustrate me sometimes when I see that someone is slacking, which is entirely possible (and quite easily too) to do without numbers. I'm much happier when I work to better myself instead of trying to change others for my sake. Take some deep breaths, chillax, and remind myself that it's just a game.
This game overall has a lovely community. When I see how rude people are to each other (on both sides) when discussing this topic on the forums, I worry about what it'd be like in game. I imagine it might even get worse.
I have no problem with SE adding it to savage content though since people say it's impossible to clear without it. I haven't tried savage, only ex primals, so I'll take their word for it.