"Straw man" in your opinion. Here is one recent action that would dispute that.
https://www.chemistryworld.com/news/europe-raises-the-bar... There are many others.
As for cost, cooler is better and lower G Max is better. The question is whether you want to improve athlete safety or not. Obviously OU does with the inclusion of a high quality pad which is a good thing.
I will give you this though, grooming is important and is neglected in most cases sometimes totally neglected.
Unless I missed it,the article you posted doesn't say anything about a any cancer case being attributed to crumb rubber.
As I posted,"crumb rubber" has been used as infill since the early 90's,with no cancer cases linked to it.
Also been used for "Fall Protection" for playgrounds.
Same thing,no cancer cases linked to it.
30 years or so,with no health issues ,is a pretty good track record.
Do you really think that, if they had even 1 cancer case attributed to "crumb rubber", it would still be being used ?
As far as "cooler is better",cooler is great,if you can afford it.
Not everyone can.
Many places down south "irrigate" synthetic turf to keep it cool.
Some school districts in places like Florida use a Aerial Tower to spray fields to keep them cool.
"Lower" GMax isn't what you're trying to achieve.
"Correct " G Max is what you have to achieve.
As I posted ,the correct GMax is determined based on sports the field is used for ,"Level" of play and other factors like weather.
Too low (soft) a GMax can be a problem, just like too hard.
You're looking for the GMax range for the field's design.
I wonder how many natural turf fields could pass a GMax test ?
As I posted,the proper GMax is accomplished with the correct thickness and mixture of infill.
Did it on every field I designed.
"Shock Pads" are used where the infill alone will not give you the specified GMax.
That's the case with Cool Play and natural infill and other synthetic turfs that use less infill.
You have to use a "shock pad".
A "shock Pad" being needed to achieve proper GMax doesn't mean the field is any safer.
It just means you had to follow a different path to get the same end point.
The "safety component" is identical.
What's interesting is that there is no evidence that a "shock pad" reduces concussions.