In fairness to Dirk, if his Mavs team was in the east for most of Pierce's career, there would have been multiple final appearances.
I really don't think you can draw that conclusion at all. The Mavs have failed against several lesser teams through the playoffs the last decade and just because they were in a more competative conference does not necessarily mean that they would have "multiple final appearances". They do have multiple appearances in the finals right now in the West but you have no idea what it would have been like in the East.
Dallas, V Eastern teams 2010: 22-8 (.730, top 3 in NBA against Eastern teams)
Dallas, V Eastern teams 2009: 21-9 (.700, top 5 in NBA against Eastern teams)
Dallas, V Eastern teams 2008: 18-12 (.600, 12th)
Dallas, V Eastern teams 2007: 27-3 (.900, 1st in NBA against Eastern teams)
Dallas, V Eastern teams 2006: 27-3 (.900, 1st in NBA against Eastern teams)
Dallas, V Eastern teams 2005: 27-3 (.900, 3rd in NBA against Eastern teams)
That's pretty compelling evidence for Dallas doing better in the East.
Isn't it also pretty compelling evidence that Dirk's teammates were much better than Paul's?
Dirk's teammates were better than Paul's until the 07/08 season. Paul's teammates since then have been substantially better than Dirk's have ever been.
They have and they haven't. The 09 playoff team had a big rotation of Perk/Baby/Scal/Moore. The 2011 playoff team finished up by starting a pg without the use of his left arm.
Did both those teams have 3 or more All-Stars? Are both of your points centered around really important players getting injured during the year (which is not a fair indication of team construction)
Dirk won a Championship against a team that beat the Celtics while starting DeShawn Stevenson for a majority of the games, and playing Brian Cardinal, Ian Mahinmi, and Peja Stojakovic serious minutes.
If we're going to play the 'end of the bench' card, the Mavs aren't lacking. Jose Juan Barea? Would any other team in the NBA have started that guy in the Finals if they could've afforded it? Did anyone consider Chandler, Stevenson, or Marion an asset of a title worthy team at the end of the season last year? Marion, Stevenson, and Chandler were basically given to the Mavs for cap relief!
I'm not even advocating Dirk over Pierce but lets be realistic with these talking points, eh?