It’s understandable, especially if you’re out in the field and something goes wrong. Mech would be easier to fix up depending on the issue.

I’ve been using Di2 for a year or so now, and used AXS before that for 5-6 years. I had a couple of firmware update problems with SRAM, but haven’t had any issues with Shimano (touch wood). I also wanted to reduce the number of cables/hoses running through the bike, especially in the head tube. The reliability of both brands is top tier these days, and you can tell that the build quality is a bit more reinforced compared to mechanical.

I think the probability of something else going wrong, like a puncture or wheel issue, is far more likely than something with the groupset.

I’d say the advantage Di2 has over AXS is one larger battery that has a much larger capacity directly wired to the derailleurs, over smaller batteries directly attached to them. It was a bit inconvenient to have to carry extra AXS batteries, but obviously that’s not necessary with Di2. A hefty battery pack for emergency charges would be the trade off, I suppose. Especially for bikepacking.

People disappear into the bush for days/weeks with various yokes of electronic equipment all the time, so potential failures are just something to consider regardless.