> But is it the same spike protein?
As far as I'm aware, yes.
> Does it end up in the same tissues as COVID? Does the mRNA delivery & creation vector matter?
I haven't seen any evidence for different tissue, or effects due to mRNA delivery & creation. Given how big the anti-COVID-vax movement and industry is I feel fairly sure that any such issues would have been found by now.
> I rolled the dice and got triple-vaxxed, on the assumption that I'm better off than getting covid with a naive immune system, but I wasn't under any illusions that it's anything but a some-unknown-%-loaded-in-my-favor dice roll.
> There wasn't enough time to wait years and see what the outcomes are, and also most people on the planet were guaranteed to get covid soon anyway.
I think this is a fair way of putting it, but at the same time it feels like the potential criticisms towards the vaccines always far outweigh any such criticisms towards COVID itself.