The DS was backwards compatible with GBA games, it couldn't have been that hard to port.
Don't forget that Nintendo, at the time, wanted to really crank that DS hardware. Touch screen, microphone, all that good stuff. Adding anything like that to a game like Mother 3 would have added nothing but annoyance, and besides, there are still the remaining issues of the copyright-skirting music, the translation taking a lot of time and money from whatever point they started it, and the fact that at that time, they believed there was no market outside Japan for the Mother series. If you remember, it wasn't until 2013 that NOA did any kind of Earthbound-related outreach that wasn't Ness's inclusion in Smash Bros, to the point where they actually spoiled the ending of Mother 3 in Lucas's trophy description in Brawl, they were that assured nobody outside Japan would ever play it.
Besides, IANA game developer, but I don't think that just because the DS was backwards-compatible to the GBA that doing a full port was as easy as that, all executive meddling aside.
---
Re: Silksong:
Managed to get the key item needed to unlock the final boss... at least, I'm pretty sure that
this time for sure, I have what I need. Knowing what I'm about to face, I expect I'm going to suffer pretty badly, but it wouldn't be the first time. My completion percentage is 66%, and I doubt it's going any higher on this file.
May as well get final thoughts out of the way now. Hollow Knight, when it came out, was pretty damn close to being a perfect game. Improving on that was never going to be an easy task, and Silksong reflects that in a lot of ways. The thing is, every individual part of the game is genuinely good. The story, the areas, the combat and movement design, it all works... but there's so much of it, and so much complexity being put into the design, that it starts to fall apart at the seams. I mean, as one step to get the true ending,
you have to jump into a foreground wall that looks exactly like every other wall to enter an area with no other, less cryptically hidden entrances, among a lot of other steps that I found totally unintuitive compared to Hollow Knight's more straightforward and understandable design.
I was one of the people who waited since the very first trailer for this game to come out, and now I just want it to be over. Funny how that works out sometimes.
Well, maybe Sea of Sorrow will bring me around on it. For now, I'm gonna finish this, play the new Deltarune chapter when that drops, and then probably spin up a totally different game about a female anthropomorphic animal with red clothing and a large weapon.