Autosense
Granted that stopping this feature would have reduced costs (more so labour than parts), it needs to be remembered that this feature was not especially desirable anyway and arguable not as convenient as manual variable power. Now, the consumer who went-in for such a cleaner would likely be the type to favour either top-of-the-range products, or else gadgets, if indeed both. With price tags of £200 upwards, a cleaner like the Hoover autosense soon found it was competing against the all-new Dyson DC01.
Towards the late part of the 1990's, all vacuum cleaner manufacturers were having to scale back their top-end of their ranges, because there was a very real risk of cleaners in that price bracket remaining unsold as consumers opted more and more for a Dyson. I don't think even Vax had grasped such a hold on the market as Dyson did, because aside from washing carpets, Vax was the same as every other cleaner and was, of course, a cylinder style, thus limiting it's appeal somewhat to those who preferred cylinder cleaners. Of those upright consumers whose head was turned by the Vax, a good deal went on to buy an upright shortly afterwards.