At face value, you're right. His mark is pointless, and in the colosseum case, degrading even.
But a lot of ancient buildings are nowadays studied for the marks found on them. If you squint your mind's eye a bit, you can even imagine that some of the cave paintings that we nowadays admire are nothing but a testament to some dude's wish to leave their mark. No one cared until someone started to care.
At face value, you're right. His mark is pointless, and in the colosseum case, degrading even.
But a lot of ancient buildings are nowadays studied for the marks found on them. If you squint your mind's eye a bit, you can even imagine that some of the cave paintings that we nowadays admire are nothing but a testament to some dude's wish to leave their mark. No one cared until someone started to care.
Funny how relative all these things are, right?