horrific but working way to summarize file sizes in a directory for evaluating what's tracked by git lfs

gistfile1.sh

$ find . -type f -name '*.*' |
  sed 's/.*\.//' |
  sort -u |
  while read ext; do
    (
      gfind . -name "*$ext" -printf "%s\n" |
        sed 's/$/+/' |
        tr -d '\n'
      echo 0
    ) | bc | tr -d '\n'
    echo -e "\t$ext"
  done

1003744	.exe
911328	.zip
806448	.dc
623008	.pck
564880	.mp4
497016	.d
351848	.efz
323112	.g
...

One little bug which probably didn't affect your results. When simplifying the extension extraction to just sed 's/.*\.//' the gfind -name test should have been updated to include a literal period.

gfind . -name "*.$ext" -printf "%s\n"