i tend to draft everything lowercase, and then go back and uppercase things depending on how much of a formal vibe i'm going for. capitalization rarely helps me formulate an idea, and so my writing often splits into phases: (1) formulation, (2) polish.
also, it's worth noting that proper capitalization does not automatically yield text worth reading. from that perspective, i like lower case text as a form of rebellion against the artifice of rules; any rebellion against particular aesthetics is fair game in my book. more generally, i'm skeptical of process advocacy in cases where the process seems to be done for its own sake.
on the flip side, good grammar helps me parse sentences, so i do sympathize with arguments in its favor.
I find all lowercase messes with my parser, and is fustrating to read. I think I may treat sentences as a single unit, and use the capitilization to detect the boundaries. Without it I find bouncing to/from sentences slower (which can happen if a latter sentence/paragraph adds more context, and I want to revisit the previous idea).
Interestingly your semi-colons stand out much stronger than the periods for me.
CAPITALS AT LAST
https://archive.org/details/livestimesofarch0000marq/page/20...
Good meme.