I'm too tired to address most of this but
>Can you tell me how many threads we're talking about here? Then we can adjust the calculations accordingly and get more accurate results
/games/ and /anime/ were created roughly 4 months after /hobby/. All games and anime threads were moved there, and all /tech/ content went back to /tech/ which was revived. This is easily 1/4 of all posts on /hobby/ at the time. Threads like Dragon Ball Z and Naruto h8 thread, the Berserk thread and Jojo's Bizarre adventure as well as Communist Anime Thread were some that I remember being moved to /anime/.
/games/ got the 'old vidya' thread, the 'last of us 2' thread the Persona 5 thread, the Freespace thread, the Outer Worlds thread the Disco Elysium thread, the 'leftypol gaming' and 'deus ex' among others. While some of these have shown activity since then. the leftypol gaming thread has remained fairly stagnant with 374 posts from /hobby/.
/tech/ recieved the fewest number of posts, mostly made up of dozens of of small threads, rather than a dozen or so medium-sized threads in /anime/ or /games/.
I can't tell you the exact numbers because I'm not a mod.
>as one board
Sure. People who use /hobby/ also tend to use /anime/ and /games/ so go ahead.
>lower the tally of total posts
But it does lower PPH, unique IPs and the posts in X and Y thread. For example, when some threads were moved to /hobby/ a lot of them had the 'request to move to hobby' posts removed pre-emptively, the same applying to threads moved from /hobby/ to /anime/ or /games/
I would, but I'm not a mod, and don't have access to anything outside of some of the public logs, which you can view as well.