Only the older ones didn't have sunshades. Horizon had "NextGen" Q400s as well, which did have sunshades. Slightly larger overheads too IIRC.

The Q400 wasn't a premium product. It was a single class airplane, no wifi, no seat power, terrible lavatory, loud cabin, limitied meal capability, etc.

It wasn't nearly as interchangeable as an E175 when it comes to swapping it for a 737 on "long and thin" routes, nor did it provide passengers with a seamless travel experience.

It just wasn't a good fit anymore. I was sad to see it go as I enjoyed flying it, but it made sense for the brand.