I'm looking for video editing software for windows 10 that supports
building a slide show from photos
inserting videos using green screen as trasparent on top of underlying photos or videos
FullHD 1920x1080 support
support of H.264 export codec
multiple audio and video lanes
support for titles
since I have a machine with 96 GB RAM, I want the software to make use of it.
For 1), a specific requirement is to have portrait mode 9:16 images scroll for a 16:9 destination format, so that no black bars are in the final video.
I am coming from old versions of Magix Video Deluxe, so I'm already a bit familiar with video editing. The UI needn't be very simple. I feel quite well switching to a more professional workflow.
Since I'm doing all that as a hobbyist and I want to be able to recommend the software to anyone else, including students and youngsters , I don't want to spend money, thus gratis.
I have already tried Blender, but even they have improved the usability in 2.8, it's just doing too much if you're only looking for video editing. All the 3D stuff is too much for this task.
I've also tried Lightworks once, but sadly, I didn't understand their concept. Also, I don't know whether they still have a free version.
I have seen the question Freeware video editing software on this site, but it does not describe the features.
I have also seen Easy to learn video editor for Windows, but as I said, I do not need it to be very simple.
I have tried OBS, but it fails on point 1) and 5). OBS will partially help me by creating videos which I then edit in the next step.