The system proposed above is how other countries such as the UK already do it, so hypothesizing that it’s impossible is an easily refutable position.
In countries that do auto withholding/filing, you still need to tell the tax authority about any tax events, but for most workers, most years don’t require you to take any action.
To add on to this comment, For the last 5 years filing my taxes in the Netherlands has involved logging into the tax app on my phone and then clicking the "yep looks good" button. This year I bought a house so perhaps it'll get a smidge more complex, but my mortgage has already been sent to the IRS-equivalent so I rather expect it to stay roughly the same level of complexity.
In countries that do auto withholding/filing, you still need to tell the tax authority about any tax events, but for most workers, most years don’t require you to take any action.