If the range increment of the throw is 5', it cannot go further than 5' from the target you aimed at, and therefore you would always deal damage to the target you aimed at. And if the range increment is 10' but the creature is larger and takes up more squares, you'd also always do damage to the creature on a miss.
You rather failed to prove that he was wrong. You can say he is, but that is no more convincing than when you say others are being dismissive.
I didn't fail to prove him wrong - he was wrong, for the circumstances described. I quoted my response above. IF the range increment is 5', or if the target is larger than one square, the splash-damage weapon always does damage to the target. ALWAYS. There is no chance to not do damage - they by definition do damage on a miss, under those circumstances. I didn't just "say" he was wrong, I demonstrated it. All you have to do is look a the rules that were quoted to see that.
I don't see anywhere in that little sentence where I mentioned the range of the splash weapon.
That's because you didn't read the rule we're talking about and so you don't understand that the splash weapon, if it misses, lands the "range increment" away. And therefore, if the range increment is 5', it must land next to your target, and therefore must damage your target. That's why the range of the splash weapon is relevant.
I understand that YOU think it is 'inconsequential' for it to be a splash weapon/grenade, but it is really rather the point.
It's not. Nobody said "there is this other rule that is identical". All I said was this is the kind of rule that applies to non-magical things as well as applying to magical things. That was the issue I raised. You're the only one raising the strawman than anyone said it was identical. Obviously, if it were identical, there would be no debate to begin with.
This is something we can address I suppose. Though the reason we generally don't is that it brings up a lot more REAL physics in a game of make believe.
The objection was that the fighter ability in 5e lacks believability. I am saying it's much less believable to me that a single vial of alchemist fire strikes everything in a 5' radius from where it lands equally, and that such cannot be dodged, and it penetrates all armor. I found it also less believable to say that nobody can dodge a fireball, except the rogue who has evasion, regardless of the circumstance, even if the rogue has a lower dexterity and less potential cover to jump behind than another character. If believability is the criteria we are all using to evaluate things (and it does appear to be that for this issue), then why are these two less-believable things acceptable to people, but the 5e fighter ability (which is more believable) is not?
Because last I checked, like a fireball or a grenade, a SWORD ISN'T AN EXPLOSION.
I never said it was. This is, again, your strawman argument where you pretend I claimed they were identical things. That's not productive Tovec. All I said was that this 5e fighter ability is
similar to a splash-damage attack. In that, much like the alchemist fire, it strikes everything in a radius (one square as opposed to 9 squares) with a minimal amount of damage, even on a miss. That's a similar thing, not an identical thing.