That whole article demonstrates why bagless vacuums are not practical:
Poor dust pick up
Price
Low Suction
Noise
Blocked Filters
It is very interesting to read what people see as important these days, and very sad (but not surprising) that only 13% mentioned durability.
Although poor suction has always existed with vacuum cleaners, it was a lot simpler with bagged machines. Why? Well, if a bagged vacuum loses suction one simply has to replace the bag and in 99% of cases the problem is solved in less than 5 minutes. With a bagless you have to empty the bin, take all the filters apart, clean in warm water and dry for 24 hours. Now tell me which option is quicker, easier, and more hygienic?
That all begs the question, if dust pick up is more important than price, why do so few people buy bagged cleaners?