Paper tax returns
You can still file paper tax returns in the US if you choose. I think many (most?) can also file user fillable PDFs if they have a compatible browser, the winds are fair, and the force is with them. I opt for paper because our return is usually a bit complicated, the modern web is such a goddamn shambles, and I can take and archive pictures of the returns, spreadsheets and scripts rather than trusting that software to read the electronic returns will still be around if the taxman comes back with questions 3 or 4 years downstream. The latter thing, backwards compatibility, has actually been a problem for a few folks using commercial products in the past.
My state (Vermont) also accepts paper returns.
I don't actually have anything against user fillable PDFs and I'd probably use them if our taxes were just wages and a bit of savings/investment income.