If you have some actual knowledge about a thing and can explain why it's pointless and already existed then that's a great thing to post. That's very different from just assuming that something you have no knowledge about is pointless, though. We certainly see lots of pointless reinventing in tech, but if something appears to be a pointless reinvention of something you could find in 30 seconds with no prior knowledge, it nearly always isn't a pointless reinvention of that and you just don't know enough to understand what's different.