Yeah, this is the deciding factor for me, too. The point of delimited text files is to find some compromise between machine-efficency and human readability. CSVs are generally much less readable than TSVs, but have less ambiguity, too. With TSVs, it's hard to tell if a tab space is actually a tab or just multiple spaces.

And with developers (especially Python devs) setting their text editors to translate tabs-into-spaces, copy-pasting TSVs results in data corruption. Or even opening a TSV in your text editor with default settings.