That's not warranted for the very very unlikely chance of that happening vs the impact that would have on getting chores done. Just keep your appliances well maintained and in good condition and then use them whenever it's convenient

Yeah looks like only heat pump driers are even allowed to be sold in the last 14 years here. But even before that, my family never had one that vented outside (Switzerland).

Heat pump dryers have a huge drawback though: the heat exchanger is woven through the condenser. So you cannot remove the condenser from the system. The lint which is not in the trap thus builds up in the condenser over time. Bad enough, but that's also where the moisture goes. So after several years it will start to reek, and your laundry will start to reek, as the reheated air goes through there.

So, long story short, cleaning that mess: you're going to have a bad time, as you can't just remove the unit and cleanse it under running water. I would rather buy just a condenser dryer (or check up whether heat pump dryers became better, our model is 7 years old now, maybe they're better nowadays).

I just hang my clothes outside, inside if its raining and use a dehumidifier if necessary.

I’d personally like a heatpump dryer, as far as I know they don’t need any venting.

Ah, that might be it. Apparently only heatpump units can be sold here in Switzerland since 2012.

Ah yeah, didn't even realize that one of those would vent the same way as the humid air. But no, I don't have a gas dryer.

Yeah, it vents out the roof

Yeah I had to seal mine. Extra important if it's a gas dryer.