Styling of checkbox does not reflect disabled state when color="default"

Duplicates

• I have searched the existing issues

Latest version

• I have tested the latest version

Steps to reproduce 🕹

Link to live example: https://codesandbox.io/s/great-montalcini-mm1rle?file=/demo.tsx

Steps:

1. Add a Checkbox component and give it the props color="default" and disabled
2. Note that the checkbox does not have any of the standard visual cues for a disabled element.

Current behavior 😯

A checkbox with the props color="default" and disabled does not have any of the standard visual cues for a disabled element.

It actually looks almost exactly the same as standard "secondary" non-disabled component, which is pretty confusing.

Expected behavior 🤔

The checkbox should have the same visual cues for being disabled that any other color variation would have.

Context 🔦

This might be a quirk around the intention of color='default' that I don't fully understand... but I wasn't able to find any documentation that made this seem like expected behavior. The term "default" here has caused confusion for my team between default-as-result-without-props and default-as-a-color.

Your environment 🌎

  System:
    OS: macOS 13.2.1
  Binaries:
    Node: 18.12.1 - ~/.nvm/versions/node/v18.12.1/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 9.1.2 - ~/.nvm/versions/node/v18.12.1/bin/npm
  Browsers:
    Chrome: 111.0.5563.146
    Edge: Not Found
    Firefox: 111.0.1
    Safari: 16.3
  npmPackages:
    @emotion/react:  11.10.5 
    @emotion/styled:  11.10.5 
    @mui/icons-material:  5.11.0 
    @mui/lab:  5.0.0-alpha.118 
    @mui/material:  5.11.15 
    @mui/system:  5.11.9 
    @mui/utils:  5.11.9 
    @mui/x-date-pickers:  5.0.18 
    @types/react:  17.0.53 
    react:  17.0.2 
    react-dom:  17.0.2