beg to differ
Well MRX it is good to see that there is diversity of opinion, and here is my counter...
I'd say that low water FLs work by tumbling the clothes at relatively high speed (higher than the FLs of say 20 years ago) creating mechanical friction to rub the dirt from the fibres. This 'mechanical' element is the flexing of the fibres as the fabric hits the bottom of the drum and as the various garments are rubbed against each other. In mechanical engineering terms, there is a considerable amount of torsion in this process. Water flow is not a particularly major part of the process - there is minimal water current in a front loader (even those with recirculation like the Zanussi), and the 'spray' of the drum lifters is far too weak to have any mechnical effect. If you doubt this, find a piece of dirty laundry and gently spray it with water (from a shower say on moderate/low pressure) to see if any of the dirt comes out - you will find that unless you are using a power washer, very little will shift other than large solids!
Water in a FL acts as a carrier for the chemical process of the detergents - ensuring the detergent is distributed through the load. The detergents break down the dirt allowing them to be rubbed out by the mechanical action of the drum movement. In addition, the water suspends dirt broken down through the chemical process and rubbed out in the mechanical process.
Top loaders work on a somewhat different principle - in fact far closer to the idea of the water cleaning the clothes. The agitator is principally designed to create strong water currents which drive through the garments to loosen and wash away dirt - with the aid of detergents again, of course. The agitator will of course move the laundry to an extent, but being suspended in a large quantity of water, the clothing is freer to move in a fluid sense than laundry bunched together in a horizontal drum.
Linting is not a reliable indication of wear and tear - it depends on the fabric, the washing time etc. All washing machines will produce lint - it is just that most of it gets washed away without being noticed - unless of course the machine has a consumer cleaned lint trap. Front loaders can score badly on this front in fact being much more sucessful at redistributing the lint amongst the other items of clothing - less water means there is less to rinse the lint away with. Try adding a shredded Kleenex to a load in a FL and a smiliar set of garments in a a TL and see which does better - I'd put money on a TL doing better, especially if it is a GE Fliter-flo or Hotpoint Filter-clean. On a similar note, large quantities of water are better where colours can bleed or run...
Without a clear understanding of the engineering principles involved it is easy to see why front loaders seems gentler, but dig a little deeper and you'll see there is more involved. It is worth remembering that most people run TLs for longer than is actually necessary to clean the clothes - on average 5-6 minutes of agitation is sufficient to clean a load of moderately dirty laundry.
David
PS - some duvets don't have buttons or zips...