Change to all-year tires with me useful?

Hello all, my 2.0 TDI Passat B7 (103 kW, DSG, variant, approx. 25,000 km per year, 60% highway, 30% highway, 10% city) would need new summer tyres and then also winter tyres in autumn. Now I’m thinking about whether I don’t go on all-year tires during our mild winters. Does that make sense from your point of view with my driving profile? Specifically, the Goodyear 4 Seasons Vector in 205 55 R16H predominates for me. In another thread, but also in the tire dimension 225 45 R17, I read about a slope z Is there anything to it? How often do you have to exchange all-year tires in an appropriate way? Thank you