Interesting input, it's always nice to talk to someone from a different culture. Regarding this macho style, I would say it has more to do with having a conscript army vs having a pro army. That is, a leader with an army of conscripts would want to present himself as a "fighter", too (thus Saddam's uniform, Putin's shirtless sniper rifle style, etc) in order to raise morale. With an army of pros, I don't think that morale is that much of an issue (it's just another day in the office for them). Regarding Putin, yes there are people who will admire his shirtless antics (I guess very few leaders could pull this off due to physique), but for me personally it would be just a show (and a ridiculous one, at that) if he didn't actually walk the walk (I mean, he took over from Yeltsin, and made Russia great again). In fact, if I recall correctly, Putin's shirtless poses came rather late in his term, when he pretty much had reinstated Russian legacy as a superpower.
Btw, even in the west, there is some show of "look at me, I'm a warrior"). Since we're talking about Macron, here it is:
Given what you have shown as an insight (and I accept it) of western political thought, I would say that Macron is rather desperately attempting to raise his masculine image. Perhaps for those French voters who didn't follow him precisely because of that, perhaps aiming at Lepen's voters, perhaps in order to elevate himself for female voters (I am not sure if women in the west would vote for a good looking macho guy (whether in uniform or not), I know that in Greece they do). Regarding China, however, I think that the nature of chinese leaders was never overly displaying masculinity to begin with. Interestingly enough, even the North Korean guy is not caught wearing a military uniform than much.
But I think that when dealing with eastern countries, particularly when "addressing" their populaces, a little personal "aggression" on the part of the western leader, would go a long way in acting as a deterrent for whether the populace itself would favour acts of aggression toward the western country whose politician displays it. But there is a catch, the politician has to look convincing when he does it. Putin gets it right, Greek politicians, for example, well... don't: