I need honest opinions...

We have 6 windows with the original (15 year old) plantation shutters. We replaced 3 windows with new shutters. We purchased this house a year ago.
We used a dealer, a guy who has his own company. He was referred to us by an interior designer who we used briefly.

He came to my house, looked at the windows and took measurements. He even helped repair some of the old shutters that we were going to keep.

We had a discussion around color choice and framing. He also provided a choice between inside and outside mount frame. I mentioned that the original are outside mount frame. He said that we can go with inside mount as well. Would work fine. I said ok. I felt like it was totally up to me, and that both would work just fine for our windows. I just picked inside, as we saw no difference. Shutters got installed. Everything was fine. Months later, I go to thoroughly clean the windows and realize that since they TILT OUT to clean, I can't tilt the window all the way....BECAUSE of the inside mount frame. The inside mount blocks the window from tilting out all the way. (The window slides up and down to open for air, but to clean the outside glass panel, it tilts out.) So our windows only functions fully with an outside mount frame.

I feel that if I brought in a professional window coverings dealer and installer, that that is part of his job to look at our windows and identify what window covering works best. I never purchased shutters before...I feel he should have flagged this. Especially that the other windows have outside mount...shouldn't he have thought twice about saying that inside mount is just fine.

In addition, we purchased blinds from him and already put in a deposit for solar shades for other windows.

He is willing to replace the shutters but is still charging us some for them, but not full price.

It was a big oversight on all of our sides, but aren't the professionals suppose to know what works for what windows? And advise the client accordingly?

What do you all think?

Thank you.