Personally, if I was in charge on writing DMC5 I don't think that this is the right attitude to take. So long as they continue to use Dante then the issue of DMC2 won't simply go away. More than inconsistencies created, more than making the new artbook outdated already, this retcon irks me due to the suggestion that 5's connection to 2 was minor enough that they could do this - I was hoping they were going to salvage 2 by using 5 to expand upon it, such as showing Dante returning from his trip to Hell and how the invasion of demons in 5 might be all connected to what he saw there. If this truly is the end of the "Sons of Sparda" era then what better time would there be to tie all the previous games in together?
But no, *sigh*. I can only hope that 5 still has a good plot...
Look, DMC2 was unsalvageable to begin with. it was a bad game, nothing more, nothing less. Dante's personality in DMC2, no matter how you look at it, was a huge inconsistency, no matter how you chose to look at it. Honestly, I agree with Foxy on that the game should have just been declared non-canon to begin with.
But, since they aren't doing that, changing it to being set to before DMC4, for me at-least, has more positives then negatives (hell since this change was made, you wouldn't believe how many people I'm seeing online are confused cause they thought DMC2 was always before DMC4). For one, as I said before telling my friends that "Oh 3 is a prequel to 1, 4 is a sequel to 1 and a prequel to 2, and 5's gonna be a sequel to 2" was always met with a huge "wtf" response, so only having to say to people "3 is a prequel" means a lot less headaches, least to me.
Furthermore, just look at Dante in 2, 4, and 5, DMC5 Dante looks (especially in his demon form) and acts much more like DMC4 Dante then DMC2 Dante. Heck, without this change, DMC5 being set after, already made DMC2 a contradiction (and nobody dare say DMC5 should have been set before DMC2 as-well, cause that cliffhanger ending being the end of the series plot all these years, had always p!$$ed me off)
I know some people aren't happy about it, maybe because they've seen the timeline as 3142 for so long, maybe cause changing DMC2's position screws with their own headcannons too much. But for my headcannon, DMC2 was just a bad dream
But hey, if it helps anyone, maybe DMC2, post DMC1, Dante was in a state of depression after having, unwittingly, killing his own brother, and gets over it by DMC4 cause A) Time does heal wounds, maybe not always fully, but still and B) he meets Nero and has family again (even if DMC4 doesn't outright say it, it honestly wouldn't surprise me if Dante knew, or at-least suspected, that Nero was his nephew)