If we are simply getting better at setting par according to the definition, is that really a change? I suppose, but it's like the kind of change that lets you get better at throwing.
We were so sloppy in setting par in the past that there would be no way to tell whether good par would have an impact. (I never use that car in my front yard that is up on blocks, therefore cars are worthless and there is no advantage to getting it running.) However, now there are some TDs who are using more accurate pars, and we are starting to see the benefits. The big tours are all moving toward more accurate (usually lower) pars. They wouldn't do that if they didn't see an advantage.
Par 2 is not a goal in and of itself, just one of the steps to get all the way to accurate par. I'm fine with anyone who doesn't want to cross that threshold, but that's not a reason to avoid setting pars on all the other holes accurately.
And, it doesn't need to be based on statistical analysis.
Here's a list of benefits from
http://www.stevewestdiscgolf.com/PDGA_Compatible_Methods_of_Setting_Par.pdf
When par is set properly:
Players have a consistent standard to compare their performance:
o To other players during the tournament,
o On different courses,
o To the expected prize-winning scores,
o To their own performance at other tournaments.
Players can better plan their strategy:
o By knowing what score they want to shoot for on each hole,
o By knowing that each bogey costs about as much as each birdie saves.
Spectator interest is increased because:
o Fans can track favorite players even if they are in different groups
o Remarkable performances are revealed, relative to a consistent standard
o Commentators have a meaningful statistic to talk about
Tournament Directors benefit from:
o A more professional appearance resulting from taking care to set useful par
o Increased player and spectator satisfaction
o Greater ease of noticing anomalies in scoring
o Comfort in knowing penalties for missed holes are fair no matter which holes are missed