On font rendering, we are hampered in some areas by patents. We have made some adjustments starting with F24 (changes to the rendering and improvements to the default system font) which you might appreciate. Good news is that higher DPIs make some of those issues irrelevant, and we're working on good hiDPI support, so.... the future is looking up.
I appreciate that you like KDE, but that's a technology / environment rather than a problem/solution. What does KDE give you that you like?
On drivers, like any Linux distro, we're hampered by the difficulty in getting vendors to even care about us. Red Hat's hardware enablement teams _do_ put in a lot of effort here, and that work generally lands upstream in X/Wayland/kernel, and is enabled in Fedora quickly.
For enabling proprietary drivers without too much pain (while still supporting and promoting open source!)... we're working on ideas.
Thanks for your feedback!