It will be if you are making a web.
Consider a tile that contains a door. When that door is closed, the tile is not walkable. That means that using clipping flags, you will see that tile as non walkable.
You could argue that you can check objects on the tile, see if they are something that can be overcome, and yes you could do that.
But objects such as doors, gates, etc. are not the only things that behave in that way.
Flags are a bit wonky. I suggest just using clipping flags to paint the different tiles values/type and you can see for yourself how clipping behaves.