I would like my digital shots to match my Portra shots in colour, but to do that. I need to shoot a colour chart on Portra, and make a profile for it. Profile the digital camera to get it to neutral. Then take that neutral profile and subtract the Portra profile from it, a lot of work!
Then that doesn't account for the masking effects, I'd rather just shoot Portra.
I wouldn't say inauthentic, I like the colour scheme of Portra, I wouldn't try to make it look like Portra for the sake of it, but for the sake of making it look like what I really really like.
And of course, I may want my work to match across cameras/mediums, I dont want to profile both and neutralise both, I want to stick to the Portra look. So I'd have to match everything else to that.