Calvin - Crushproof hoses certainly have been around a long time. But they are NOT truly crushproof! Ever wonder why TriStar, Patriot, Miracle Mate and Riccar/Simplicity canisters have the plastic "hose cuff" at the machine end and handle end of the hose? It's to keep the hose material from crushing! Plus, if you step on those hoses one too many times, they will crush in permanently and require replacement. If you look at a replacement TriStar crushproof hose that has been left sitting on the wands for too long, you will see what I mean - the material starts to bend and droop down at the handle end.
As for why Cleva is still using the wire reinforced material? Probably because it's a signature feature of Kenmore/Panasonic canisters. They have been using that material since the 1060's. Also, if you take a look inside of a Kenmore hose blank, they are actually fairly smooth, and more importantly, VERY wide inside. That would allow for plenty of airflow movement. And Cleva isn't the only one doing this - the Perfect C103/Clean Obsessed CO888 and Aerus Guardian Platinum canisters are still using wire reinforced hoses, and the Guardian Platinum is pulling 116" waterlift through that hose material!
You should also be aware there is a aftermarket adapter for the Kenmore 600, 700 and 800 series hoses that will allow 32mm universal attachments to fit these hoses, it's only $15 bucks on Ebay. Plus I have made one myself for my Kenmores by simply using a metal Miele tool adapter with some red Tuck Tape wrapped on the outside to make it fit snug inside the hose handle.
https://www.ebay.com/itm/356425758974?_skw=kenmore+hose+adapter&itmmeta=01JWVMGKD99F6221ZEM08ACDM4&hash=item52fca178fe:g:iOMAAOSw7ytkDeCo&itmprp=enc:AQAKAAAA0FkggFvd1GGDu0w3yXCmi1chgpY3rjlq79sZb+vmm/PwNK7guWaOIvo8RobGiDCoQnLGRrgP0CNP9jPgt48CFj/vPlUvAIyVBZHfdBh6yk7W7IWNvUaKk2DFkCRl245KYu3uGgIoI7sAQNP9JZ5fqOymQtiuMcIbWnVkFu5jc6VPhQjVt/Znfe3J4LlOduAJ7rcWNJctKKTi0JC/D7KbOqpRElbH4ol+Et1bxTwZZpFkAdpqxZeNf3/H1fppTNE+OmzxRCPNhXijp9sN5p8CEP8=|tkp:Bk9SR-62wvTmZQ
As for those Euro style hoses that Miele and Sebo use? Those are NOT crushproof hoses. Rather, they are referred to in the industry as Cord Welded Hoses. Yes, they do solve the issue that Wire Reinforced hoses have and Crushproof hoses have, in that these Cord Welded hoses cannot be crushed and caved in by just stepping on them. BUT, they actually RESTRICT airflow, NOT improve it! The cord is actually held in place in a plastic tube that is glued in place inside the hose material, and that tube takes up so much space inside the hose material it actually interferes with the airflow. This is especially true of the Chinese-made Miele Style canisters, like the Vapamore Vento and Cirrus canisters. I had to do a repair on the hose handle of my Hoover Windtunnel Anniversary Edition canister recently, and I was actually shocked by how much room that plastic tube took up - so much it looked for sure like it would cause clogs in the hose!
As for the Kenmore BC4030 and the new powerhead design - Cheesewonton, that is a shame that Cleva is choosing to make parts unavailable and makes you buy the powerhead entirely! I agree with Panasonicvac that it looks cheaply made. However, if I was recommending a new canister vacuum purchase, I would recommend a new Kenmore 600 series canister anyday over a Miele or Sebo to the average consumer. Miele canisters may be nice, but their quality has gone too far downhill in recent years. The new Guard M1 series looks like it has been cheapened A LOT over the C3 series it replaces. Miele canisters are no longer worth the prices they command new IMHO. And Sebo, although they are nice and comparable to Miele in quality, the problem I have with them is their S Class Filtration System, which claims to be comparable to HEPA H13 Filtration but is NOT! Their filtration system is absolutely inferior to Miele, and there's no way in good conscience I could recommend them when a conventional canister vacuum with a sealed HEPA Filter system would filter BETTER for LESS MONEY! And I do believe these Kenmores would last at least 15 years with reasonable care and maintenance. So, for me, a Kenmore at 1/2 the price that would last nearly as long is a no-brainer over a Miele or Sebo. The Vapamore and Cirrus canisters would also be a fine choice as well.