Black Tiger makes some great points. The SNES game wasn't necessarily the original vision in the first place... it could have been a compromise all along. It's kind of like the original Lunar on Sega CD. It wasn't their original vision. A port to the SNES/whatever might have ended up more faithful than the original game.
That being said, when Lunar was put on the PSX (supposedly in "truer" form), it was worse, which proves that sticking to the original vision or the original version doesn't always make for a good game.
It never looks like a transparency from a SNES, or a Saturn, or whatever.
Saturn and transparencies don't mix.
You can talk theories, and programming skill, and single screen tech demos made 10 years after the death of the system, but the shit never actually happened on the PCE during its life which leads me to believe that it was either impossible, or such a bitch that it wasn't worth it because there is no shortage of good programing in the PCE library.
You make a good point here, and it's one that I agree with. SD3 was never ported to the PCE, and no one ever really asked for SD3 to come out on the PCE anyway, because there were already tons of other great programs. All the theories about "how" to do it (or not do it) don't matter, because all the talk in the world can't change the past.
there is such a thing as reality and reality says that you can't do Seiken 3 on a PC Engine and achieve anything that does the source material justice.
...but then you turn around and start talking about it again.
There are plenty of games that do things the PCE wasn't supposed to be able to do (Sapphire, Metamor Jupiter, etc). In one breath you say it's pointless to discuss this, but in the next breath you bring the topic back and try to "win".
You seriously think the PCE couldn't do the original source justice? That's a huge claim to make -- since "do justice" doesn't even imply "perfect". However, the point remains... it WASN'T done and it's not going to BE done so, as you said, it's silly talk. It's easy to beat your chest when no one is going to ever prove you wrong.
Personally, I believe it could be ported in near-perfect (or superior) form. It's not like we're talking about porting something intense like Ranger-X. We're just talking about the Seiken Densetsu games!
You can't to Gran Turismo on the Watara Supervision, you can't do Sakura Wars 3 on the Vectrex, you can't do Viewtiful Joe on the MSX.
Silly comparisons. The generation gap between the systems in your "examples" are all huge compared to the difference between PC Engine and SNES.
And besides, the PCE is the better system of the two, so your analogy doesn't even make sense.