Sure, though the question was about "making a table cell editable" requiring pages of obscure code.
_Technically_, it requires a single HTML attribute.
If you want to build some sort of reactive, spreadsheet-like experience with cells and calculations, then yeah there's some inherent complexity in that.
I find that hard to believe.
And not to "uhm, ackshually" you, but what you're describing is possible via the native HTML "contenteditable" property.
https://developer.mozilla.org/en-US/docs/Web/HTML/Global_att...
(Actually doing something useful with edits is another story, but that's not what the comment is about)