I found this to be a great question because I can see both sides of the picture, as well as the answers.
"Are portables really portable" : They can be!
It is true that "Portables" have gotten heavier as the years have passed and this, for the most part, was a requirement/request by the Professional Cleaner themselves. They requested; More & more of everything. Pressure, vacuum, etc, etc........... Therefore, it became as we all have witnessed; a double-edged swore.
We realized this a long time ago and developed "portables" which could be operated at great distances from the base unit ; even from a truck. Fast forward to today, now one can acquire a more middle of the road performance package such as: 300+ psi; much larger industrial vacuum motors in a package weighing approx. 45 lbs. which has the capability of cleaning easily at 50 feet from base unit.
Great question and topic.
BTW, haven't seen Stuart Clarkes name for a while and it was a real pleasure. What a neat Gentleman.
Best to all above;
Ed Valentine