As Tim said, this is really a matter for theming. There are several themes and example configs available that make Org buffers "pretty". For example:
https://github.com/kunalb/poet https://github.com/jonnay/org-beautify-theme https://lepisma.xyz/2017/10/28/ricing-org-mode/ As well, faces are easy to customize using: M-x customize-apropos-faces RET org RET There may be improvements to be made, but the defaults shouldn't be set to match the preferences of any one user. Remember that people have been using Org for years, and theming and faces are very personal. ;)
