I own my own vacuum shop. We sell and repair all brands (except shark) of vacuums. We make good money cleaning vacuums and doing the exact same thing outlined in the owners manual.
It isn't necessarily true that bagless vacuums are dirtier, messier, etc. I have hundreds of pictures in my phone of filthy, nasty bagged vacuums in for the same service. These are to show folks in the vacuum industry who live by 'bagged is better'. The truth is, bagged is clean only when you take care of it. Bagless can be clean but only if you take care of it.
The average consumer knows nothing about vacuums, bagged or bagless, as far as their care. The consumer will continue to spend money on vacuums that they THINK will take care of their needs. If you try to make a hard case for bagged vacuums, they need to be machines like the Aerus Electrolux with bags you cannot get in 'wrong'.
Failing to install the bag correctly is the number one problem with bagged vacs. As simple as a Simplicity type A bag is to install, you wouldn't believe the people who didn't take the time to shove the cardboard onto the spout more than an inch or so. Of course, the bag comes off and fills the compartment.
All the Kirbys in for service have filthy cloth bags. I make good money cleaning and servicing Kirby. I've washed hundreds of Kirby cloth bags in my washing machine, and charged good money to do so.
IF bagged vacuums were really better than bagless, I would not be able to afford the things I can now. It takes just as long to clean and detail a bagged vacuum as it does a bagless. In all cases, money moves from one wallet to another (mine).