Edit in plaintext mode

This can be already done in few ways, depending on what advanced functionality do you want to strip/preserve/add. So IMHO, this request can be archived.

(a) In OS, Set preferred default app for opening/editing “.md” files. Then in Obsidian use command/hotkey “Open in default app”.

(b) Use theme, e.g. Theme: Simple Plaintext

(c) Use CSS snippet which modifies/preserves only features that you want.
For example the following shows headers in standard font-size and removes strike-through line but preserves bold text, elevated block-IDs and footnote references, …

:root {
  --font-size: 100%;
  --font-family: Source Code Pro, Fira Code, monospace;
  }
.markdown-source-view {
  font-size: var(--font-size); 
  font-family: var(--font-family)
  } 
.cm-header {
  font-size: var(--font-size); 
  font-family: (--font-family); 
  } 
.cm-strikethrough {
  text-decoration: none
  }

Related:
Whitespace characters can be shown by Show whitespace plugin .

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