Creative? Yes, always. It's my most defining trait. Numerous realms.

Not having "not having BP" as an option, it's impossible to compare and know if I would have otherwise been creative or not. I can say that consistent productivity is a challenge. This was even moreso the case before medication, which I mention because that's a common concern -- that medication can "kill" creativity. That's not my experience. It didn't kill it. It did help even out productivity though (not that it's all evened out, lol, it's just not so drastically uneven). (With properly tuned meds of course.)

I don't think I'm promoting any myth. I've been creative forever, and certainly long before knowing about having BP. I have both. Make of that what you will. I think it's fair to say that, even if you don't believe there's a connection, there is a certain help in hypo/mania's bolder attributes. Fear kills creativity. No fear? Well, it doesn't hurt, you know?

That said, I do HATE the romanticization whereby people seek to "legitimize" their claim to creativity via BP. As if it's some kind of requirement. That's nonsense. There are creative people who don't have BP. There are creative people that do have BP.

You ask if the BP makes me more creative. I'm going to say yes.
You ask if the BP robs me of motivation and ability. I'm going to say yes.
I think that if you've got the creativity (whether it be inherent or linked), the BP cuts both ways.