About a year ago Ubunty changed its default compression level for its initramfs handling down to Zstd level one to deal with slow initramfs creation times on low-end systems / development boards. But since then that has resulted in larger initramfs sizes and yielding other bugs like more quickly filling up the /boot partition on Ubuntu systems. Thus the developers have gone back to the drawing board and are trying to figure out a path forward for better initramfs handling that works well for low-end single board computers while also maximizing space savings and working out well for all Ubuntu use-cases...