It's a good point; I really love the new style, but it certainly feels built more for new users, or maybe no users and just an "overview of Construct".
I think the page functionality could certainly be brought more toward the advanced users (e.g. Adobe CC went through the same journey). The fact that it takes two clicks to open a file is a good example of that. Your suggestion about having more Recent File slots as well. Giving more real estate to advanced user flows, rather than things like social media, the more balanced it'll be.
Just for fun - a starter thought on how it could go: