Star are different in some or maybe all cases. There should be no dispute about that. Might be just a change to improve the load rating or might be a tread compound or design difference. But that does not mean your BMW will perform poorly with non star tires.
I recommend doing some research on what others have used or what should work well. For the Michelin PS4 with star for the F90 M5, it appears there is a Continental tire that is a great alternative — even BMW is using it.
If you don’t know what you are doing or don’t want to research, buy star tires. No one is saying they are not a good choice. Some of us are simply saying there may be additional choices that may be considered.
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