I am grateful that Knots exists for several reasons. One is as a useful social signal: many of the people frustrated by the predominant attitude toward spam in bitcoin opt to signal that frustration by switching to Knots; some make it their first node. I think that is a good thing, and strengthens bitcoin both socially and in terms of network health. I also think the default mempool policy in Knots is wiser than the one in Core.

That said, I do not personally use Knots. I often use Core to test my software and ensure it can work on mainnet.