Yes but most high handicappers mainly reach for driver on Par 5's and 4's.
Now I'm not proposing that they hit 3 x 7 irons or 3 x 6 irons, but most would be in range if they did that, if not on. Even accounting for one being a duff, possibly on in 4, normally using their shot would still see a nett par.
At my own course the par 5's, off the whites, are
503 yds
474 yds
499 yds
491 yds
The average high h/c will hit a 7 iron around 130-135, but lets be generous and say 140yds. 3 true hits gets them to 420, that is assuming they can do that consistently. They then have between 50-80yds and 2 putts to come away with a 6 and 2 points. You are asking for 4 good iron shots on the trot with your method. If they could do that then they would not be a high h/c
I completely get the point you are making, I personally often use a 3 wood off the tee as I am pretty consistent with that, 180yds and straight, and using your head instead of going for driver each time would certainly help. The 7 iron, 7 iron approach would make sense at times, although I would argue on a lot of par 5's it just leaves too much, and is something to think about. Maybe for par 5's around the 450yd mark it would be more feasible?
The point where this started was a good golfer stating a par 5 hole is easy to score on and a few of us less skilled golfers suggesting it is not that straightforward. I still think that is generally the case, although there are many variables to throw into that that would disprove my point.