> the first letter in each sentence isn't capitalized. This is so far the most glaring signal of slop.

just fyi, it's a very common manner of writing for younger folk online. more so in informal contexts, but as with everything else, once it's widely adopted it starts to creep into the more formal communication. it's not about "slop", it's just a cultural convention.

i should also note that many languages that got their orthographies defined relatively recently (e.g. various native american languages) use all-lowercase as well, by design. so there's no inherent reason why english can't do that either.