IMHO it depends so I take exception to the use of "never" in both quotes... but... I would like to see the full context and source for both statements.
Every accredited course I have either participated in or done an audit on (probably 10 or so different RTO's) has demonstrated joining two snatch straps.
IMHO the discussion doesn't go deep enough into the pros and cons of two snatchies V one and an extension and the course usually just has the "how to" demo and thats it.
When I present that module I usually include a quick discussion on the merits of both as when you are out bush the old "whatever needs must" comes in and you have to use whatever is available.
If you have two snatchies and no extension or only one snatchy and one extension (and have tried all other avenues first) then use what you have.
The main thing to consider over a kinetic strap and a static strap when using two snatchies is the extra rebound distance before the kinetic energy is zero.
I'll ask #1 son what his views are when he gets home - he is a Heavy Vehicle Recovery Trainer/Assessor and does up to 25 tons (IE 50 ton rated straps on 25 ton trucks and plant)
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