The glycol isn't the ONLY factor, just the most egregious. We just feel that since compatible products are available for use, there's little incentive for us to act as product testers/investigators. I'm not inclined to say "yeah, it seems the same, go for it" without testing it. I'm also not inclined to spend time and money testing products just to make another brand available when viable options are already allowed.
Hope that helps.
Glenn