This is where language becomes a problem (in saying that I recommend to anyone who is interested they read The Tyranny of Words by Stuart Chase, https://www.goodreads.com/book/show/2343374.The_Tyranny_of_Words). It is a common problem for many people (especially in technical discussions) to not first define what they mean by some words.
So what does “decentralised” mean in this context?
Could having a thousand pools owned by a thousand different actors be the criteria for decentralisation, even if they are only using 5 to 10 different infrastructure providers?
Like I said many of the idealists will require as much decentralisation as possible at all different levels, but what types of decentralisation are actually important?