I'll start off by saying this is both hypothetical and an edge case but...
I have just come across a room in a desert building which, had I not had at least a fairly good jump power increase (you would need about a 25% height increase), would have contained an inescapable pit and further a portion of the room would have been unreachable.
What makes this an edge case is I play on "I am already the guy" so this only occurred because of the random chance of platform choice, indeed there was an identical but escapable pit next to the inescapable one. The difference was one had a few ladders left in the entrance and the other didn't.
Now, the issue as i see it, was not that the platforms were gone, but that the players has no way of replacing them, player placed wooden platforms are far too large to fit in the gaps in buildings. With the way it stands the hardest difficulty runs a risk of being about having the correct powers, rather than about skill or patience. Obviously the argument could be made that by playing on the hardest platforming difficulty the player should be paying more attention to the escapability of holes but this case would have been pretty hard to judge before hand.
as a secondary point, is it possible to take the platforms that are hidden off the minimap? It lying to you is fairly unhelpful.
EDIT:
Is this correct in the next update notes:
The density of tiles per monster spawner in boss rooms has now decreased from 30 to 50 tiles. This makes for fewer trash mobs swarming throughout boss rooms, although they are certainly still there.
As an added rule, the minimum number of nests is now 2 rather than 1, however.
Density has decreased from 30 to 50 (This is an increase should it be the other way around?)
Minimum number of nests now 2 instead of 1 (Should this be 1 instead of 2?)
I'm confused sorry hope I'm not been thick!!!
I think the notes are a bit vague but the point it is trying to get across is....
Previously you would be getting 1 spawner every 30 tiles, now you will be getting 1 spawner every 50 tiles.
To compensate for this somewhat the minimum has been made 2 spawners.