If this how you read and you're enjoying reading, that's all that matters. How you do it, silently or reading out aloud is irrelevant.

FWIW I would focus more on what makes me happy, than what anyone might think.

I used that technique on one of my early books. I couldn't think of a better way to tell the story. The feedback I got from readers was they really enjoyed the alternating POV. Especially when I would have both characters describe the same event. It gave them a richer overview of what was happening.

Not sure I'll use it again. All depends on the story. Sometimes it just works.