The only upside, and it might have been accidental, is that since everyone has the same schedule of powers everyone is equally affected by changed to the length of the adventuring day.
In other words, having only one fight a day helps the fighter, the warlock and the wizards, and helps them the same amount. So it doesn't create new balance issues (beyond being trickier to make fights challenging - and that not too much.)
The downside, of course, is that wizards and fighter having the same number of daily abilities is rather contrived and gamist.