F0SSIL it might be possible, but I doubt it would be something that they'd want to change for one very big reason: why fix something that isn't broken?
The files that our phones fetch are very small for both Apps and OS updates (35 bytes and 29 kb respectively, according to my computer after downloading them). I also gather that these files are static, so server load is likely very negligible.
Also, to add to what was said between @F0SSIL and @raccoondad... I think discussing possible improvements is a good way for the community to brainstorm, and good ideas may even be eventually accepted and implemented by the project. I don't know what the developers would think of this idea in particular, but constructive discussion amongst community members about changes or features can help make our ideas better.
But let's try to avoid stating that other forum members' ideas aren't useful. In this case, I think it's a valid suggestion, but unlikely to be implemented at least in the short term because doing so would mean spending a lot of time on Apps app instead of working on other higher priority projects.