My 2 cents for what's it's worth...
People here who are saying they like variety, I couldnt agree more.
BUT... it is much more one sided recently in terms of quality of steels recently and that favours flat & matte. Which everyone has a right to say that it's getting annoying and cheap. And I agree.
Glossing and bossing in my opinion is far better, but I do concede that flat or matte ( or both together ) can look okay- dependent on the artwork though.
But here's the thing, flat & matte it's Waaaaay over used on steels with great artwork and that cries for a bit if glossing & bossing of sorts.
The whole thing that got me into steelbook collecting was the great products that they were when they were relatively new, Iron Man, Thor, CA, Zavvi Disney range blah blah blah.
You all know the golden age I'm talking about.
Forgetting the premium guys, the lack of steels with attractive finishes are getting rare as rocking horse s**t. The odd one has come out like Daredevil and a couple of others, but it's not what it used to be.
Although the premium guys do some excellent steels, even the much worshipped Blufans are guilty ( ducking from the gunfire). By this I mean the lack of bossing on their steels of late, titles only. Winds me up a bit, knowing they can produce quality.
After years of FA pumping out generic WWAs, I'm glad to see their recent WEA efforts are top notch - Spiderman for example.
Sadly though, whilst so many new collectors are coming in, the quality and frequency of steels are getting dire, and for that I think we all lose.