Why didn’t Opel become a top premium manufacturer?

I don’t get it wrong now, I don’t want to make the Opel brand bad, on the contrary, but I would be interested in it. And considering that in the 70s Opel produced beautiful large luxury limos and coupes al la admiral and diplomat with large six and eight-cylinders, there is somehow not so much left later. And somehow I don’t see the senator as a real top class limosine anymore. The stuff to build big cars, the e could have been in competition with the S-Class and 7s. Audi had not had a really big luxury car on offer at this time and look where they are now. Of course they had bad luck in the past, e.g. Lopez (he said so?), who saved on the Astra up to no more, where they still have to close today. Mitn Kadett E started already, although he had a much more modern body shape compared to the 2 golf. (Mal so ne little Fra Is Astra F really not nonsense? At best there can be a Kadett F, or an Astra A, isn’t there?) What do you think?