Thanks!
Platformers don't turn on hitting terrain, yes, I believe this is a misdesign. Over 10 years ago, I copied this behavior from L2 because I assumed L2 to be the gold standard.
On a fresh design, I would have the platformer turn. It's inconsistent w.r.t. the builder, and (platformer and builder) are much more closely related than (miner and digger, where the digger won't turn on steel but the miner does).
Even with the turn-on-hit builder, a builder bridge is easy to make traversable in both ways. A two-way-walkable platformer bridge is much harder with a turn-on-hit platformer, unless the two shoresides are exactly the same height. The non-turning platformer gives us more leeway. But I doubt this counterargument wins against the inconsistency argument.
At least we can fix some backroutes by giving platformers instead of giving builders.
-- Simon