Why do snares stop channeling spells? (Complaint about Galio UP)

Galio is in need of some love. I just got my ultimate ruined by a Leblanc with her chain ensnare. How is that fair? It just restricts Galio from moving, how would that prevent him from standing still forcing enemies to attack him, logically? It doesn't make sense. Next thing I know, Janna uses her ultimate to knock me away because she's no longer taunted. Not that it matters, it's the fact that the ultimate gets interrupted and doesn't deal any damage at all every time that happens, and there are way too many ways to interrupt it.

Snares stopping recall makes sense, because recall is a mobility thing. But normal channeling stuff shouldn't be lumped in with recall.

Besides fixing up his ultimate, you could do the thing where an ability scales with more than one type of stat. You could make the healing from the shield for Galio be increased, based on MR/armor/health, you could also increase the damage on resolute smite by any one of those stats(we see Shaco getting bonus AD and AP scaling both on his 2-shiv poison, so it seems reasonable for Galio to get for example armor or health scaling for the smite). We can even go with a defense stat(probably MR) boosting the movement speed bonus(what, Janna can have her movement speed scale with AP but Galio doesn't get stat scaling movement speed? that's not fair) from his windstorm. This concept goes along with my previously made thread about tanks needing their abilities to scale more with the 'tank stats' instead of with just AP all over the place.