It is relevant because if you are for instance a FR-US dual citizen (because for instance you were born in the US while your parents were working there as an expat for a few years), you can freely settle in Switzerland (CH-EU free movement agreement). In any cases you have to do your IRS stuff whatever the amount you are earning so this is already a problem and if you work in IT you salary will easily get over 100k which potentially trigger amount to pay (even with the high tax rate of CH). My colleague in front of me, was a US citizen because he was in this exact situation, and was tired of all the paperwork required by his US citizenship (and the fact that all the banks were considering him as a liability). So if you don't intend to live in the US, having a US citizenship is a problem for a lot of people, and if you have to pay for it, it becomes a burden (including all UE/CH-US dual citizen living in CH).
Anyway all of this to say that about 25% of the worldwide US renunciation are taking place in CH, so this figure alone prove that this is a problem in this country.