I tend to agree with
@coleAK in regard to long term prospects of electronics. Solid state was once sold as superior and forever. They do have specific lifetimes due to things like what
@bloc said with capacitors, but also lower level electromigration affects. Higher power and lower physical feature size optimization only exacerbate this. Mechanical systems are more easily reproduced and fixed later, but the highly integrated and miniaturized ICs...good luck.
I respectfully disagree. The pressure and heat loads on modern differentials is higher than ever with increasing engine outputs. Especially against towing and heavy constant loads. It's why the Tundra, with otherwise generally the same drivetrain uses such a large 10.5" differential with the 5.7L engine. Earlier Tundras had smaller 4.6L engine option, and those would only be fitted with a 9.5" diff similar to ours.
Which reminds me to service my diff fluid. I haven't checked the fluid after re-gearing and re-building, and have had some long heavy tows trips at over 15klbs on 35s. Makes me wonder if the diff is up to the job and my lead foot. So far so good, but probably worth a flush as diffs can get really hot in heavily loaded use cases.