honestly they just shouldnt be forcing the mobile auth stuff down our throats, if we believed we needed more security, we'd use the mobile auth stuff
but valve shouldnt be putting so many restrictions on people just because they dont have ONE extra form of security available
especially when the restrictions just make trading ANYTHING painful
think about this:
You want to put up your key on the market for 2.59, which is lower than all the other key prices at the time, you put it up but wait! it wont actually go up until 15 days from now, and 15 days from now, people are now selling keys for as low as 2.48 which means theres absolutely no chance of anyone caring to buy yours, so you remove it to re-add it and update the price, but now you have to wait 15 days again, thus preventing you from really using the market AT ALL
and nobody is going to want to trade with someone if they have to wait 15 days to recieve their items, you're basically like a diseased person to anyone else that everyone would want to stay away from trading with, thus meaning its impossible to use trading AT ALL
just remove the restriction stuff, keep the mobile auth and everyone will be fine.