There's usecase for #PoW & #PoS.
Both can and will be useful.
There is no just "one."
If you think there is, show me an example where there is or has ever been just one of anything. I'll wait.
Discussion
There is just one nostr:nprofile1qqsyrhshwxsrrz3anwd0nlc6ps78hyrgvl9x6njagv6630ukpvwnyscpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtcpz4mhxue69uhkummnw3ezummcw3ezuer9wchszrnhwden5te0dehhxtnvdakz7dpdfhq Thankfully they broke the mold when he was hatched.