For having never played Earthbound Zero, I found the TAS very boring to watch. I found nothing that caught my attention. The walkathon, while possibly being the best way to complete the game, made me wait for a few minutes to see what would happen next. Due to the game having Japanese text, I couldn't figure out what was going on until I read the author's comments. I thought that the final boss would have some interesting action in it, but due to the requirements in beating the boss, the battle turned out repetitive and boring. The "bread crumbs" glitch skips the entire game, which makes me not learn about the Mother world at all. If I would have played this game beforehand, it might have been more interesting to watch. I think that another Mother TAS run should be made alongside the glitched run that doesn't invoke the "bread crumbs" glitch.
P.S. The tune to defeat the boss is catchy by the way. I remember hearing that tune somewhere else when I was younger.