Yeah, a matter of preference I’m sure. I prefer not having to scrunch a little at the waist to reach e.g. “cargo” pockets, and there’s nothing like interior breast pockets on jackets, for pants (various sorts of hidden pants pocket exist, yes, but they’re hard to get at). No extra weight pulling pants downward, requiring a tighter belt (or suspenders—which, that part I’m on board with as long as the pants have actual suspender buttons!). Can take the jacket off and remove all burden, put it back on and be ready to go again. No sitting on things, having things pinch or poke your leg or hip when you sit.

It’s basically a looser way of wearing your stuff on you, than pants pockets. Less welded-to you. At some point I realized I disliked summer starting because coats and front-pocket/pouch hoodies went away and I had to start carrying things in my pants again. Later, I came to like the standard pocket systems on blazers & friends way more than hoodies and (modern casual) coats, and discovered that with the right fabric and (lack of) lining choices I could wear them in almost any weather if I wanted to (I don’t, every day, but weather’s no longer a major reason not to)

(I am not saying I’m right, just explaining what I get out of it over extra pants pockets)