Same for most AMD laptops as well.

I thought compression would not help much with disk space as well. I believe it depends on the use case. After switching to btrfs and enabling zstd compression, my Arch install reduced from 100GB to 60 GB in terms of used disk space. Most of the savings are from documentations of development packages.

If your dGPU supports rtd3 power management, it should (almost) completely power off when not in use. For me the battery life changes a lot: is something like 2 hr vs 10hr battery life with the GPU off, which is very noticeable.

Well, most (if not all) freesync monitors flicker when the frame rate changes. You are probably jumping from 48 to 120 or similar. You can use freesync only for fullscreen apps on kde plasma if that works for you.