Someone who speaks the truth. If you're going to do something, do it right. Don't take the easy way out because the end result may/will suffer, regardless of what you're doing (music, visual art, editing, writing, etc.). Perhaps you're not interested in making a lot of remixes, or maybe you are. Either way, it's good advice.
Saving time is a good thing, but so is not having to rely on something being there to help get you started. Namely, because it won't always be. I've never used a MIDI in my life, namely because I learned to play by ear. So to me, using a pre-made MIDI as a base just seems off. Backward basically.
I know not everyone (anyone?) will agree with me, but that's all just my opinion. Take it or leave as you see fit.