I can sight read tab to a pretty high level, e.g. I was able to sight read my way through most of Capricho Árabe at first glance if that means anything to anyone. I just started teaching myself classical guitar in August and I've completely fallen in love, it's all I listen to and I practise hours per day.

But I am now teaching myself standard notation because I am running up against the limit of tab. I keep having to go back and forth between someone actually playing the piece and the tab so I can get the rhythm, and sometimes I'll find I internalise a rhythm incorrectly and then one day when I'm listening to the piece played by a pro it clicks and I realise I've been playing it wrong this whole time.

There are sites like https://www.classtab.org/ which try to add this rhythmic information to tab, but I don't think it works all that well.

Honestly at this point I wish I'd started with standard notation, or at least learnt both at the same time.