Because the Mercedes solution works, today, with legal guarantees, under quite precisely specified conditions. It allows you, in those specified and advertised conditions, to play a game or read a book or take a nap while driving.
In contrast, Tesla only has promises. In practice, you can't do anything with FSD that you couldn't do without it, because you have to pay exactly as much attention when it's engaged as when it's disengaged, and you can't take your hands off the wheel or it full-on disengages.
Mercedes has an excellent base to build up from. Tesla has next to nothing.
I don't get why people cheer on it and even compare it with Tesla, which goes for ... actual self driving
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