The restaurant we did was so greasy that the grease wasn't just on the surface, but all the way through the pile in the traffic lanes, how would / could encap deal with that?
Don't get me wrong, I like encap in certain situations, but I'm a bit too fond of putting the dirt where is belongs, down the drain to use it across the board when people are paying good money to have their carpet 'cleaned.'
If we are faced with this scenario on a synthetic carpet we use Chemspec Enzyme Carpet Shampoo boosted with Energizer and Traffic Lane Cleaner through a Cimex with a quick pad off to finish. Obviously if this was a wool carpet this wouldn't be the preferred method. Perhaps as the cleaning phase but we would then rinse out the enzymes. On synthetics a good scrub and pad with these products is all that's required.
I am fortunate enough to own (or have owned and moved on from) every system available and as stated previously agree that the system that suits that particular job, budget and requiment should be used.
As I operate exclusively in the commercial sector (office buildings) nobody will pay the money for full cleaning when presented with the option. Most of the contracts we do already use SEBO BS36 vacs (or equiv), partly down to us and the carpet manufacturers specifying them, so post vac removal of polymer and in some cases Pre-vac isn't required as they prefer to do those stages in house to further reduce cost.
In every situation I have used HWE on heavily soiled office carpet tiles we have always returned and pad/Encap cleaned the following day to get the Improvement in appearance we desire. This is even with post padding on the first visit. We actually now feel that forcing the carpet to wick back results in more complete soil removal. We tend nowadays to only HWE as the first clean in a maintenance program to "empty out" the carpet prior to continuing with pad Encap (we use an encapsulating rinse in our extractors also). I have sites that haven't required a further extraction clean in 15 years with quarterly visits and good in house vacuuming.
Although we use LM cleaning more than 95% of the time it wouldn't be my first choice for domestic carpets however we have it should there be a need for it. We also have dry compound but that hasn't been used in over 2 years now.