Truck mounts are quicker on the bigger jobs, easier to use, due to no fillling or emptying, and you are guarantee hot water, all the time.
If you do a lounge only, then there is no saving on time, but the results will be better, and the carpet dryer with a TM.
the attitude of spfcleaning is typical of everyone who does not owe a TM, me included until I purchase one, after 2 years of thinking about it.
The TM is not the one and only machine you need, you still can't do sissal, belgian wiltons, sky rise flats, or work on houses were parking is not possible. And I still perfer a portable to clean upholstery.
The TM has its place in the market.