Loyalty doesn't require driving dynamics. As long as car is hassle free, rides nice, looks good and has a good name value, people will come back to it. I think Lexus and MB does that very well.
Now for BMW, it's more of a "maniac" crowd than "loyal". Typical so called BMW "loyalist" admires Porsche or higher performance brands and tend move on as soon as their status elevates. But Lexus and MB loyalist really don't give a shit about other cars, they will just stick to their S, E class or LX,EX forever.
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