String interpolation is so ridiculously slow. Epic slow.
Perhaps just as importantly is that is a crutch for many to avoid accessing the DOM in steps. You can read from the DOM with querySelectors but you cannot modify the DOM with them. If querySelectors is all you can do then you must use some third party template system because you have no idea how any of this works even though it provides maximal expressive freedom.
Is anything preventing JS from compiling the proper stepwise dom access if the querySelector parameter is a literal? That would basically push the interpolation into the parsing step.
Perhaps just as importantly is that is a crutch for many to avoid accessing the DOM in steps. You can read from the DOM with querySelectors but you cannot modify the DOM with them. If querySelectors is all you can do then you must use some third party template system because you have no idea how any of this works even though it provides maximal expressive freedom.