Hmmm
I'd go along with him on the 70/30 rule as if it is 50/50 then it certainly is double weighted, so in that respect he's completely correct. 50/50 weight bearings make movements slower to execute.
However widee stances are good espcially if you're progressing in your art.
" Don't confuse yourself with someone who has something to say " - The Fall
" I do not like your tone/ It has ephemeral whingeing aspects " - The Fall
" There are twelve people in the world/ The rest are paste " - Mark E Smith