I don’t understand your question. The W1 is the washer. The matching dryer is the T1 and it is a heat pump, not a condenser. Neither one involves ducting. That’s the whole point. As for lint, there are three filters, or rather three stages of filters. All very easy to access and clean.

I own my second Bosch condenser dryer. The lint is trapped in a lint trapped. The only time I've seen airborne lint was when a conventional dryer was installed in a closet without proper venting.

Condenser dryers trap lint in a special filter which needs to be cleaned.

I have not had any problems with lint with the Miele (8023 is the model I think) dryer. Have been using it for 3+ years now.

No issues at all with the T1 heat pump, nothing is exhausted to the air. There is very very little heat that is pumped out during a cycle which comes out the bottom of the dryer (if you have it stacked and have the drawer you will notice the contents of the drawer are slightly warm).

From a lint perspective, when you scrape the two lint filters after a cycle some may go airborne (as with any dryer) but it's very little.

I think you might have seen a Miele vented dryer that was vented inside into an 'indoor dryer vent trap'. These you have to fill with water to try to trap some lint from the exhaust and there will be lint all over your walls if you don't keep up with it.