How is the East weaker? Cleveland, Boston and Orlando are in the East, and the East has a better conference record.
Your conclusions about the relative strength of the rest of the playoff teams is a complete fantasy, and is not borne out by the facts.
The West has a higher proportion of very bad teams, and that artificially inflates the records of the .500 or better clubs. Conversely, because the East has 3 very good teams it artificially depresses the records of the rest of the EC teams.
If you look at the records of the EC playoff teams all except one have a winning record against the West.
Since the out of conference match-ups are 2 games, it's not a whole lot to go on. Other factors, like whether the game was played on a back to back can skew what little information there is.
Phila. won both their games against Portland including one in their building on a the 2nd game of a back to back. They got a split with LA. They're clearly competitive with playoff teams out West.
The fact is that Houston and San Antonio aren't as good as Boston and Orlando and the East is the better conference.
Do you really want to break it down?
You make the comment about back to backs and travel, etc. Then don't take those into account when evaluating Philly's record.
Your argument is that the east is stronger based on interdivision play. I showed that removing the east's "big 3" shows that the east has a losing record vs the west. Now you are saying that it isn't proof of who is the superior conference.
And the fact that the 2nd & 3rd teams in the east are better than the 2nd & 3rd in the west doesn't suppoort your point of view. Especially when teams 4-9 in the west are better than the 4-9 teams in the east.
Who is better (who would you rather play just twice vs 4 times)?
Atl or NO
Miami or Denver
Philly or Utah
Detroit or Portland
Chicago or Dallas
Charlotte or Phoenix
Another way of judging a team's strength is home/road +/-. Compare a teams road wins less their home losses. The top 9 teams in the west have positive results in this measurement. The east has just 6 teams. And only the "big 3" would rank above the 8th seed in the west.
You can look at just about any measurement rick...and except for the big 3 the east is weaker than the west.