It's not convenient that you have to constantly check the MARKET order limit - you can't buy quickly or you can't close it on the MARKET quickly. It can automatically - if the MARKET volume is entered in excess - send several orders with a breakdown of 0.1 seconds. For example, I bet to buy 2 million coins - and the limit is 1 million coins - the system will send 2 orders of 1 million each. And closing as well. It would be VERY convenient not to check limits at all when trading fast!

This is similar to your floating order - only for MARKET orders.