Every time something is made easier for people, there's a corresponding drop in the skill level of the average practitioner.
Hmm. I don't think that's enough of an argument to not have standard replacements of this kind. To put it this way: if the average practitioner wants to write a program with 256-bit integers, and acknowledges he's incapable of maintaining that in C, won't he just switch to an alternative, like Python?
You can do that in any language by constructing something (ie. struct in c#) in that language that consists of multiple instances of primitive types that store the bits. For example if you want to create a 128-bit data type you'd create a struct holding
two 64-bit integers on x64 or 4 32-bit integers on x86 machine.
Sure, it's possible, but to rephrase my question: why isn't it standard already? I mean, the last C standard was published in 2017, long after Big Integers became a need. And still, the largest standard integer you can define is 64-bits long.