Because I wanted to trade a specific coin that had a really good price at that moment.
Yes, the account was limited as I haven't used the platform for a very long time. (reply from the support)
But I have to say, I had a really good experience right now. I got a reply to my support ticket in less than an hour, after which I uploaded my KYC documents and now less than 24h later my account is verified, SO ALL GOOD!

(though the coin is not at that price level anymore

)
Well then that's great. I guess you are one of the lucky few. Based on the number of negative reviews and experience expressed by a number of unhappy customers in this thread. I would still suggest you still take caution while using the exchange.
Cheers.