Multiple PSUs are not a problem if you connect them with a relay or with a simple multiplier cable.
I think most non-technical people are unable to identify real source of the problems they face.
To my experience, most of the time these problems are caused by a low quality PSU which is a grave mistake.
Faced with power related problems they come to wrong consequence which result in erroneous comments like the one you linked.
So long story short, use powered risers and supply power to 4-pin molex on your board.
I've been using one of that board since 2014 (older version) with no problems.