What do you always think about the ADAC recommendation new tyres on the rear axle?

Hello to all I have once asked a fundamental question which I had asked yesterday already in another form. And this is about whether two new tyres should be mounted better on the front or rear axle. The ADAC recommends that new tyres always be mounted on the rear axle because of the track guidance, since a sling is more dangerous there than on the front axle. As far as understandable. Now, however, the ADAC also recommends to exchange the tyres regularly every 10,000 km, so that you gle After 10,000 km, however, this would mean that in the case of a fron-driven vehicle, the worse tyres are sitting on the rear axle. I have exactly this problem, since I currently have about one year old summer tyres on the rear axle, which still have a good 5-6 mm profile tip. Now I get two new tyres and think about where to mount them. I am primarily concerned about safety, not about the costs. do not buy 4 new tires if the other two are still new. I would be happy about answers, Many greetings Robin