I understand that there is a similar question about this, but I would like to phrase this in a different way.
In Harry Potter and the Sorcerer's Stone there is a series of tests that someone attempting to get to the stone must pass. There is the locked door, Fluffy, Devil's Snare, the key room, the chess room, and the potion room. However, most of these tests could have been much better implemented.
For example, why a giant game of chess? It is made clear that if they didn't play the game, the stone statues wouldn't let them cross, but this is not very efficient. Lord Voldemort is a very smart wizard and would be able to win a simple game of chess. Instead, it could have been just an army of stone statues that attacked whoever came close.
Since the enchantments were made by Hogwarts teachers, if someone needed access, they would never actually do the tests, rather the professors would simply undo the enchantment to let (let's say) Dumbledore through.
Therefore, it seems pretty crappy to have these obstacles have a way around them. Why not just put it in a room with no doors that only Fawkes can apparate into? Then only Dumbledore would be able to get in with side-along-apparition.
Is Dumbledore intending Harry to fight Voldemort? Is there some reason someone, who was not well liked by the staff might need it who wasn't evil? They seem to be taking unnecessary risk. So, is there an actual reason? Or was it just a plot device?
Edit: As I said, I am aware of the similar question. That question asked IF the Stone was well protected. I am asking, rather, WHY was it NOT well protected? Why was there ANY possibility to bypass the protection? Why were there tests that could be passed, instead of obstacles that could not be circumvented?