Why can't we use both the --versions and --installed-on-request flags at the same time with brew list?

[nbro]

Output of brew config

HOMEBREW_VERSION: 4.2.20
ORIGIN: https://github.com/Homebrew/brew
HEAD: c2ed3327c605c3e738359c9807b8f4cd6fec09eb
Last commit: 8 days ago
Core tap HEAD: d6500a8912b02f838d9edf36263f6487fb8af34d
Core tap last commit: 26 hours ago
Core tap JSON: 06 May 12:34 UTC
Core cask tap HEAD: 8f1cdf8d25c0f626b622362cedaf76c4c428c6f5
Core cask tap last commit: 26 hours ago
Core cask tap JSON: 06 May 12:34 UTC
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 8
Homebrew Ruby: 3.1.4 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/3.1.4/bin/ruby
CPU: octa-core 64-bit haswell
Clang: 13.1.6 build 1316
Git: 2.32.1 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Curl: 8.4.0 => /usr/bin/curl
macOS: 12.7.4-x86_64
CLT: 14.2.0.0.1.1668646533
Xcode: 13.4.1

Output of brew doctor

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: You have the following deprecated, cask taps tapped:
  caskroom/cask
Untap them with `brew untap`.

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  openssl@1.1
  python@3.8

Warning: You have unlinked kegs in your Cellar.
Leaving kegs unlinked can lead to build-trouble and cause formulae that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
  glib
  numpy
  kubernetes-cli
  gnupg

Warning: You have an unnecessary local Cask tap.
This can cause problems installing up-to-date casks.
Please remove it by running:
  brew untap homebrew/cask

Warning: You have an unnecessary local Core tap!
This can cause problems installing up-to-date formulae.
Please remove it by running:
 brew untap homebrew/core

Warning: Homebrew's "sbin" was not found in your PATH but you have installed
formulae that put executables in /usr/local/sbin.
Consider setting your PATH for example like so:
  echo 'export PATH="/usr/local/sbin:$PATH"' >> ~/.zshrc

Warning: Your Xcode (13.4.1) is outdated.
Please update to Xcode 14.2 (or delete it).
Xcode can be updated from the App Store.

Description of issue

I want to see the packages I installed and their versions. So, I was trying to do brew list --installed-on-request --versions, but brew says that these flags are mutually exclusive. I don't really understand why this should be the case. Any good reason? If not, then this behaviour should definitely be changed.