That's the extreme end of things. It's like saying that no application can ever be decentralized because developers are involved. If you're looking for a perfect system then blockchain doesn't make sense. But in that case the internet doesn't make sense either and we should all go back to pen and paper.
I haven't heard of that as a best practice. In my English class in high school they only mentioned to keep it consistent. The preference should be given to the writer. Both men and women have contributed to society so their pronouns can safety be used in written text.
The redditors in /r/machinelearning have shot this idea down many times. A few common arguments:
1) It costs more and isn't as performant as tuned machines.
2) The training data is very valuable and shouldn't be shared on a blockchain and restricted to a closed network.
Maybe there is one advantage though. Crypto people have bought up all the GPU's.
That's a big issue in rural areas with microwave links. Everyone who has one of these links is limited by bandwidth and they all want to watch Netflix.
Would you agree that this is a harder problem than say casino and gambling on the blockchain? There are great use cases for improving trust with smart contracts and ledgers that prevent the house from cheating or running off with the money.
Check out the book The Billionaire's Vinegar by Benjamin Wallace if you're interested in learning the background on why blockchain technology won't solve these kind of problems. Hardy Rodenstock fooled the foremost wine expert in the world.