https://bitcointalksearch.org/topic/someone-please-tell-me-this-isnt-how-transactions-always-work-758927
I happen to think this is a pretty serious drawback for adoption.
That's just Hive. Bitcoin let's you chain transactions one after another. If they all have proper fees, they will all get accepted in the next block at the same time. Mycelium let's you do this without a problem. The only issues you might see is if you use LocalTrader's confidence graph it will not go past 50%, or if some wallet service tracks for unusual transactions (such as those with unconfirmed inputs) they may not accept your transaction until it is confirmed in a block (happened to me with BitPay, but my unconfirmed input was a single transaction sending 1mBTC to 30 wallets, with no fee, that took 30 hours to confirm).