It's mainly about free luggage and business class checkin when traveling with my family. I have already priority pass for launches, however, I need to pay the $32 for my wife/my son.

In addition, the Amex Plat is an additional cost of $695, whereas the *A Gold via UA will be free-of-charge since I earn it via business travel.

What other way do you think about while mentioning "You can get *G on other carriers and get UA Club access on domestic tickets". As said, with Lufthansa I managed every year to get between 70k and 80k miles (and sometimes ups to 80 legs per year), but never reached the 100k to get gold.