You shouldn't be leaving any significant amounts of crypto on Binance anyways, a lot of people will say that it is super trusted but it doesn't matter. Not your keys not your coins. If you have to trade only do small amounts at a time to hedge your risk.
What dollar amount do you think is small???
$300USD worth ??
$3,000 USD worth ?
obviously $30,000 is not "small amount" by any stretch..

Definitely if you can afford to lose those amount then amount won't be matter. Store it at your own risk.
When using Binance with my iPhone5 and iPad Air, the boxes where you can Buy or Sell are not able to show up. Anybody else have this issue??
Happened that before even I reload it, I just use android phone instead. Sometimes iphones are a bit laggy ( maybe because of the OS ) even you have a good internet. I suggest use other phone when you're using mobile.