My setup works well for me.
Inside the shop is simple. The through the wall pipe connects to a Y, which divides into a 4 and 2.5 inch port. The 2.5 goes to a blast gate then to the DC over the blade (Shark Guard). The 4 inch goes to the 27 ft hose, which most of the time is much shorter since all my cutting tools are on one end of the shop. Near the throught he wall pipe is a switch to turn the DC on and off. Electrical goes through the wall.
I have tightened up some of the flex pipe so it no longer droops, but never seem to get around to taking a new pix. I am a hobbyist and rarely have the DC on for more than a few minutes, and most of the time the temp when I'm out there is great. Except during the deep freeze winter and scorcher days in Summer, I generally have no problem keeping comfortable out there.
I fully understand what your point is, but I'm not nor have never run a commercial shop, which you obviously have. I also know that when someone's on a budget, that the price of a DC unit is often enough to tempt a hobbyist to buy another tool instead of DC. If someone has a commercial shop or does a LOT of woodworking, then your points definitely apply. But for me, with a split shop, the two HF units is a perfectly good solution, and the drastic reduction in sawdust littering the shop is evidence enough that the HF units were a good investment.
When I went looking for DC alternatives, the comparable unit cost was almost 3 times the HF unit. But who knows where most of the small shop units are made. A number of them likely are made in the same factory as the HF, the mid priced ones certainly are made in Taiwan at best. Compare the Jet drill press to the WEN, They have identical casting marks, and there are many brands made in the same Chinese factory.
So I will continue posting when they go on sale, and hopefully, you'll keep sharing your view, and the members can make up their own minds. There is nothing personal about our different opinions, and NEVER any disrespect intended toward you. We're just starting from different places.