I don't really think tennis compares that well other sports in this regard. Entering suboptimal distances is more like entering singles and doubles.
People still disregard the Aussie Open in the early years until somewhere in the 80s to some extent cause not everyone used to play it. Methinks that there's gonna be a lot of attention at RG to someone who's not there, and I don't think that's a good thing. Maybe I should blame the media for that, I don't know. And as for an athlete's obligation, I think there's an argument that the obligation you mentioned isn't always the case cause there are the Masters 1000s where a large proportion of players is required to play 8 out of 9 a year. And still, if you make a rule then a player still has the liberty to make pragmatic choices for himself in that sporting perspective.
I'm perfectly willing to admit that this a pet peeve of mine. I consider it somewhat irrational myself too. But this kind of thing leads to a lot of what ifs, and that's never all that fun, and I fear where this might lead to, because if you apply this logic to a lot of other events, freaky stuff happens. I'd want to see the best players duking it on a variety of surfaces and if this gets more common it would happen a lot less on RG and maybe even Wimbledon.
And honestly if Federer showed up at RG and totally semi-tanked it, I'd wouldn't care nearly as much.