This Exoslide system aims to improve linear motion precision and rigidity but still uses the standard 2020 frame. This is an Ender 5 kit and more are in development. Check it out and let me know if you think this is worthwhile.
Does this increase or decrease the printable area of 235x235?
No change. Btw on the Ender 5 it seems to measure 220 x 220 mm, despite having the same 235 x 235 mm bed as the Ender 3. There just isn't the same amount of travel.