Question about Microsoft Lumia 650

Yes, that is correct. I can't change the circumstance either. Ask the manufacturer why this is the case and why it is offered in Switzerland. what do you expect?

I'll also explain to you what I think is stupid:

A better question would thus be... Why not inform yourself beforehand and perhaps spend a little more than the 140 francs if you already have demands? Keep in mind that 3G is still far from being available in all countries and many still have 2G and will or must continue to use it. Maybe look at the whole thing globally and not with Swiss glasses.

Thank you for your attention.

(And PS: Please do not take it too firmly personally, but with a good pinch of sarcasm and irony.)

It is not a problem if the second card only shows 2G, the device can only use one data connection anyway. However, you can switch the data connection between the cards at any time. Works without problems.