It's supposed to give immediacy but loses out on effective time manipulation, making transitions and time jumps harder (imo). Ergo a lot of detail seems to crop up which can be happily dispensed with in more distant, less immediate POVs.
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I guess to me, this isn't true though, it is someone trying to lay out absolutes in the same vein as "Having more than one POV is confusing and ill-advised." (another thread right now talking about that)
that's a statement so strong it isn't just not always accurate, I would argue it is RARELY accurate, not because beginning writers don't make a mess out of 2 or 3 POV at times, but because it is their underlying weakness in the mechanics of writing.
There are basically 2 present-tense constructs I've seen, those which cover a few seconds to minutes and so they include everything (and they tend to be a device specifically to showcase conflict) and those that cover broader scenarios, but they still don't cover a full day, or full hours....they are a series of present-tense vignettes making up a day. And between each one? Those dead spots where folks are pooping, or doing something else devoid of conflict.
note none of the above says you can't do the writing without conflict, but if you do you will tend to lose writers.
Again I don't care if you shave; I do it all the time.
If you're thinking about all the gray in your stubble and I'm getting a sense of your struggle with your own aging (conflict) I am interested.
If you're doing it while trying to listen, to hear if your wife who was supposed to be asleep yet, is creeping around the bedroom looking for her phone, and who the fuck would she be texting the minute you leave the room, and at 5 in the morning, and after she was pretending to be sound asleep (conflict), I'm interested.
If you're doing it while you replay how you are going to finally tell your boss you deserve a raise, or while you wonder how you're going to pay for college, or if your kid is ever going to be smart enough to even GET to college, and maybe not wind up like you did (conflict, conflict, and conflict) then I'm interested...