we can now “redump” Emacs
Hold your horses: there are still bugs in “redumped” Emacs, so it is too early to announce a victory and make it sound like everyone can now use this without fear. It will take some non-trivial development work to clean this up, as there are many problems that need to be found and fixed before this becomes a reliable feature.
Famous last words.
Seriously, though: RAM is cheap until you find your system filling all the RAM, and the OOM killer kicks in. then you will treasure every single byte of memory you can avoid using.