That's a fine - and not unlikely - interpretation of how things are portrayed.
Unfortunately when making evidence based conclusions we can only go on what we know as certain and not what we believe should be valid or invalid. We can't know if these portrayals of older Miqo'te are by choice or forced due to PS3 limitations unless SE comes out and states it explicitly. Which they have not.
After all, there are older Hyur and Elezen models, so why did they leave out Miqo'te, Lalafell, and Roegadyn? Could it be that Miqo'te, Lalafell, and Roegadyn just don't age much when it comes to appearance? Right now there's more evidence in game that they don't change much at all. Asserting that those portrayals are invalid due to your feelings about limitations is a supposition at best.
Of course, SE could come out and depict older looking Miqo'te any moment, which would change the evidence supporting my current conclusions. That's the great thing about making conclusions based on evidence, the conclusion can change based on new evidence.
Unfortunately when making evidence based conclusions we can only go on what we know as certain and not what we believe should be valid or invalid. We can't know if these portrayals of older Miqo'te are by choice or forced due to PS3 limitations unless SE comes out and states it explicitly. Which they have not.
After all, there are older Hyur and Elezen models, so why did they leave out Miqo'te, Lalafell, and Roegadyn? Could it be that Miqo'te, Lalafell, and Roegadyn just don't age much when it comes to appearance? Right now there's more evidence in game that they don't change much at all. Asserting that those portrayals are invalid due to your feelings about limitations is a supposition at best.
Of course, SE could come out and depict older looking Miqo'te any moment, which would change the evidence supporting my current conclusions. That's the great thing about making conclusions based on evidence, the conclusion can change based on new evidence.