, as a big fan of the Mk VI design and Chief's history in it, I agree and am glad they're not putting him in new armor.
I'm just making the case that I don't believe based on anything we've seen in the lore that Chief would have the same feelings of attachment to the Mk VI; it was, after all, just the latest in a long line of iterative upgrades to the Mjolnir platform he's been wearing since its inception. He didn't demonstrate any reluctance to replace his Mk V at the beginning of H2, and I don't believe there's any documentation of him hesitating to replace any of his armor prior to CE, either. I think John primarily views his armor as just another (albeit the most important) tool in his arsenal- it seems to me he's far more concerned with its utility value than its aesthetics or its sentimental value.
In fact, the only suit of armor I can imagine Chief being emotionally attached to at all is the Mk VI MOD, from H4-5 since it was basically designed by Cortana for him, personally, and he clearly won't be wearing that in Infinite.
In short-- As fans, we understandably love Chief in the Mk VI. As for Chief himself? He's never been shown to care much what armor he's using, as long as it's mission-ready. I'm just wondering how 343i is going to handle the fact that John's (by choice or assignment) wearing anything but the "latest and greatest," Mjolnir the UNSC has to offer. Unless his Gen 3 Mk VI really is the best armor available, which is possible, but would make the Mk VII a bit of a headscratcher.