Did the Celtics surprisingly get taken to the limit by the Hawks? Yes. Did they almost lose the series? Of course not, any other view just ignores the facts. Before the series even began, having home court meant if they won every game at home, they would win the series. Nothing extra is granted by winning in 4 or taken away by winning in 7, the winner advances, the loser goes home, period. The Celts did in fact win every game at home, quite handily too, since all they had to do was win all their home games, and they were not once challenged, it simply is not true that they almost lost the series, since they had to drop at least 1 home game for that to happen.
In fact, rather than looking back after having dispatched Detroit and LA in 6, and using the 7 games against Atlanta as revealing a chink in their armor, it was the grind of that series that set them up to do so well in later rounds. You simply cannot separate the Finals from the 1st round the way Stephen A. and others have tried to do. Precisely because they were taken to the limit by the Hawks, was instrumental in their development. If you use the, "they almost lost to the Hawks" logic, then you must think the Hawks are better than Detroit or LA since the C's took fewer games to beat those 2 opponents.
If the Celts had to play Cleveland first, and won in 7, then Atlanta, does anyone think that would then have been a 7 game series? It must be seen as a progression, with the inexperience of the new C's team showing up in the 1st round, after the starters sat for 2 weeks, then steadily working through those first time experiences to achieve the ultimate success.