At least in Canada for the last couple years, our tax software can download all that from the tax agency and plug that into your forms automatically. And for most people, that’s all the info there is.
There aren’t a lot of “elections” or “decisions” to actually make when filing.
And there’s a lot of stuff that doesn’t happen automatically because you •could• have the same investments across multiple brokers, but that’s not the majority either.
I pay private agents all the time to avoid having to deal with terrible governments interfaces and find shortcuts, wins for me.
which is to say, that worry shouldn't stop anyone from trying their site.