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How does it compare to a mesh-lined carrier?
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Never had a carrier with full mesh backing. I have added pads that were mesh covered closed cell foam for both shoulders and plates front and back. The pads compress to the point where there's no airflow going into the mesh when I have the plate carrier and cummerbund adjusted with no shifting while moving exercising. They end up trapping a lot of heat and while it did create some air space at my sternum area; the portions of my body touching the pad itself ended up being hotter than everything else. 3D mesh on those pads did absolutely nothing in terms of wicking sweat, temperature regulation or overall sweat evaporation but they were significantly more comfortable against my chest and back.
Mesh wrapped closed cell foam shoulder pads also really did nothing in terms of offering load bearing support, only load bearing tolerance. The weight never feels distributed evenly across the pad, it only makes the pressure point feel less annoying. These were with 2" wide pads shoulder pads and I think 1/4" thick (can't quite remember the thickness). It made no difference on a Daedon since the Daedon shoulder was already comfortable to begin with. Made a difference on comfort for my JPC 2.0 though. Heat wise the pads made my shoulders even hotter than norm and that's just sitting around.
Closed Cell foam wrapped in 3d Mesh add on pads for chest and back? Not worth it.
Closed cell foam wrapped in 3d mesh wrap around shoulder pads? - If your carrier has thin and narrow shoulder sections and considering you can get these pads for like $30, I suppose that makes it worth it for comfort only. Edited to add: If you've ever read advertisement on any shoulder pads that state the pads will spread the load over a wider surface area, closed cell foam mesh pads won't do it (at least the ones I tried, neither will IceVents).
If I had to guess, a full mesh lined carrier will suffer the same issues of foam compression (and the heat build up) on contact areas but will overall wick away more sweat mainly due to the sheer amount of uncompressed surface area that can actually receive some airflow (compared to just mesh/foam pads).
Edited to add:
If the mesh material is like a 3D mesh without a foam backing like found on a small section of the front and back of the JPC 2.0 (pic below), note that that mesh compresses pretty easily and likely the mesh would compress all the way down until your chest or back contacts the plates. This would likely cause hot spots and a lack of airflow as well. The material may wick moisture away really well though and would allow moisture to evaporate rapidly on the uncompressed areas, but I'm unsure of this.