PD had a set average amount of time they wanted it to take for people to reach max level. The problem is that they skimped on the events a bit and are forcing the player to "grind" on events they have already completed. Things that could/should have been better are more events, being able to clear trophies for championships, being able to sell all cars from your garage. I think the last two would make high level A-spec less dull to many people.
This is it in a nutshell. If PD had bothered to offer as many in-game events as were in GT4, you wouldn't HAVE to grind, or at least as much. What people are saying (and the apologists refuse to acknowledge) is NOT that they want to level up faster... just that they want to level up without so much repetition.
I don't care if it takes just as long as it does now. Just that I don't want to REPEAT, over and over, the same races I've already played. Perhaps if the AI were less, well, artificial (!), perhaps if the game altered what they drive in response to what YOU drive, perhaps if weather and lighting changed earlier on in the game structure, then repeating events wouldn't be so bad. But right now, this is nothing more than Bill Murray in Groundhog Day. It's COOOOOLLLLD outside!
The seasonal events, the (temporary, so they say) upping of cr. and XP is a help, but, to be honest, we don't need more XP or money. We simply need LOADS more events in A-Spec. Many tracks are totally unused. Many cars are totally unused. There's virtually no Spec racing (provide everyone the same car, temporarily, like Special and License Tests). There SHOULD be a way, a path, topwards leveling up that doesn't involve ANY repetition. That PD haven't BOTHERED to make one is simple laziness in the extreme. How long, for God's sake, does it take to think 'OK, 4WD cars on London, backwards... MR cars on Eiger Nordwand... Vitz's on Cote D'Azur... Samba's on Cape Ring Inside...'? That took me as long as it took to type. Forget reward cars. Just cr. and XP. We would LOVE this.
Death to grinding!