Windows 98:
Disable Task Scheduler with msconfig and enable file extensions and hidden files in the folder options.
Windows XP:
Patch uxtheme.dll and install a dark theme. After that, enable file extensions and hidden files in the folder options.
Windows 10:
Install the Linux subsystem and Debian. Then run Winaero Tweaker to disable advertisements and telemetry and get a bash on right click.
After that, enable file extensions and hidden files in the folder options.
MacOS:
Run a bunch of console commands to make sure it doesn't create DS_Store files. Run a console command to prevent it from adding attachments as thumbnails in the mail program. Install MountainDuck to get around the fact that the Finder is garbage software. Install Chrome because Safari is terrible for web development. Eventually realize that the OS itself is a raging dumpster fire and go back to Windows 10 😄
Bonus - Android:
Root the system with Magisk and install AdAway to remove ads in every browser and application.