The question wasn't directed at me, but I do have an opinion: Simpler design. Every issue I've seen with ARB lockers (which is quite a few, way more than any other locker) involves the air line, and the damn diff has to be taken out of the axle to fix it. If I ever bought a truck with an ARB I wouldn't pull it out right away, but the first time I had to get into the diff for any reason it would get replaced with an e-locker. I do not understand the love for those things. When it was the only option, sure, but there are much better options now.
My father in law has an ARB in his JK and I have seen it down a few times. Be it a leak, busted line etc. Yeah the E locker are more expensive but if you factor in the cost of the damn compressor it is almost a wash, and I believe trail repairs on an E lockers wiring would be easier then repairing and air line.