I would suggest the following mental exercise the next time you want to make a comment on HN:

Imagine you are at a dinner party at Paul Graham's house. He's there, obviously, along with several startup founders, aspiring founders, and a few established industry figures, including the person you are about to disagree with or criticize.

It will undoubtedly take more effort to figure out how to frame your criticism so that it doesn't make you a pariah, but the advantage will be that you will leave open the possibility of forming beneficial business and personal relationships.

In this case, I would try describing your own successes with building redundant services, and describe some of the other approaches you found while researching ones that you have built.