DicemanX
Brain of Cthulhu
It's not deniable that it takes significantly more mechanical skill, ingenuity, and technique to beat any boss through more "normal" means than it does to use something such as runway or tanking. But that's besides the point, I never said I thought they'd give him countermeasures to carting away, I said that I think they'll fix the bug where you can kill invincible enemies with the cart. It might take more effort than it does to camp on a spike, but unless someone officially states that it's intentional we should assume that it was not, and bugs like this don't usually last forever after becoming known.
You're painting it as a black and white issue when clearly it's more nuanced. Precendents exist on both sides - the devs have been OK with certain non-standard ways of beating bosses and they have fixed other non-standard approaches. It's pretty evident that the devs are OK with approaches that require some degree of effort and/or some degree of constructional skill.
Since we have yet to establish whether killing the eyes with the minecart crosses that line from acceptable to fix-worthy, it's best to hold off on making any judgments. However, I anticipate it'll be more difficult to make it work consistently, and coupled with the fact that it's only relevant to a portion of the Moon Lord fight and it's only slightly better than other approaches, I seriously doubt whether this is even remotely in need of fixing.
Also, as far as fixing something because it's a bug, the devs have already demonstrated that they don't automatically do that (two major bugs are now essentially "features" of the game).