One of the cases that would make sense is to create an AG if you buy and sell real estate.
In most cantons, the tax rate on real estate capital gain depends on how much time you have kept the flat/house. So if you buy flats/houses to renovate them and sell them soon after to make a profit, you would avoid a lot of taxes with an AG.
Moreover, if you do a lot of trade without an AG, the tax office will consider that you are a real estate professional, so you will need to pay income tax, AHV, and real estate tax on capital gains.
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Just for the sake of transparency: do I remember correctly that you work for international organisation, so you donât pay taxes, at least on your income?
I used to work for an international organisation, you are correct. The salary was not taxable. I have moved to new adventures now, although not because of not paying taxes 
OK, so you already know that it can change the perspective on taxes (been there, done that ;)).
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Actually not 
I did not change my stance on taxes, whether I was paying them or not.