Mayday issued (because it was later cancelled) and choice of airfield questionable. Might be nearest but was the emergency so bad that you would choose it ? Cat 1, no problem but asking for cat 11 or cat 11, airfieled surrounded by some serious bits of earth (called the Swiss Alps) and an approach not easy in CAVOK !
Lets start at the beginning;
Mayday issued. Do you think it shouldn't have been because you appear to suggest that?
Airfield questionable; Why? It's a company destination, they probably have experience of it and it was close with multiple landing options and suitable weather.
Was the emergency so bad that you would choose it; Yes, it's a red and see above.
Cat 1; What's wrong with asking for the autoland? If the smoke continues and visibility becomes a problem, it's a potential life saver. An auto land will also control the RoD which may be a factor (it is on the 777 for overweight) although that's not necessarily a consideration depending on the circumstances.
Swiss Alps; So what? They're approaching from the north where the terrain is lower and under radar control.
An approach not easy in CAVOK; Sorry, I call
on that one!