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That isn't actually true, to the best of our knowledge. That was Chuggaaconroy unknowingly parroting satire.
(Didn't think I'd be talking about Chugga any time soon...)
Dexit being planned for SuMo is a reasonable assumption, because non-regional Pokémon barely appear in those games.
If we assume that Island Scan and the Nugget Bridge homage were late additions, the only evidence against this theory is the stuff at the Battle Tree.
To keep with the topic of Unovan first gyms, Striaton Gym is basically a check on "do you have the gift monkey from the Dreamyard", making it one of the worst boss fights conceptually.
The only other thing it shows off is the rework to Pickup, which isn't really that relevant in-game with how...
Emerald's 212/213 discrepancy is either the second Lati or the second Moon Stone evolution.
Because the second Lati in non-Japanese copies of Emerald requires record mixing, it shouldn't be included in the count.
By your logic, we'd also have to blame either all freezing moves or all thawing moves in Gen I on-cart play.
(Yes, I'm deliberately invoking a fallacy to make a point.)
I feel it better for Gen 2 to add a desync clause to cover any future desyncs, despite the only current desync being on an unviable move. But that's not the point of this thread.
That's not an error. All five of those evolutions are naturally obtainable pre-credits without any trading, so the HGSS Johto Pokédex was expanded from 251 to 256.
The problem with tiering BDSP is that it just feels like an easier DP. Aside from the obvious drops of Bidoof and Wingull because HMs no longer exist, the tiers would be almost exactly the same.
The only required HMs were Cut (BW) and Surf (B2W2).
They don't have official badge requirements, but there's no way to get Cut in BW without the HM, and acquisition of Surf is tied to story progress. I'm not sure if you can skip anything by trading over a Surfer to B2W2.