It's a legitimate concern, but it's also deliberately designed to be easier than SMW and SMB3, which had those save modifications made so they could be portable-friendly games, which they absolutely were not in their original incarnations. But it's a moot point now regardless.
I never understood that "not being able to save anytime I want" problem. Just go back to W-1, get inisde the tower, finish it in two minutes and save. Problem solved.