This week I was impressed how balanced the game at level 4 felt with a bard, a cleric, a warlock, a fighter and a rogue who carried on after a medium to hard fight, taking a short rest and took on a hard to deadly fight afterwards.
In the first fight to to some bad luck, full casters spent more than half of their spells and extra abilities from class and feats and also the fighter and warlock had to spend all they had.
In the second fight, some luck on the players side allowed them to get in a better position than expected and by spending all their resources, including those from feats, they could turn a close fight into a win.
And all classes seemed to be able to contribute equally. Probably the next fight would have tipped the scale in favor of the non casters and the warlock. But the game seems well balanced around one short rest in tier 1.