Called up the local airport fire service where I keep my private aircraft, and asked 'em if they would consider foaming the runway, if requested.
The answer was a very firm no.
The general consenus was that it provided little, if any, benefit.
And...the same shortcomings as mentioned here.
This particular airport has nearly one thousand private aircraft based, with many high dollar business jets as regular daily visitors.
The fire service appears to be second to none...response time two minutes, day or night.