I paid for 4 to use 2/ R for a couple months, but did not have as much success with complex tasks as hoped. But this was awhile ago, and it feels like they degraded 3.5 since then, because it is also not as useful for me lately. I can only consistently use 3.5 to debug & for small code blocks

Yeah, I feel like that’s what’s happening to me. It’s very useful for other tasks (re-writing, etc), but I feel I must be doing the coding thing wrong because it just makes me mad when I can’t get it to work properly, haha.