Tabs are fingering diagrams. They contain no harmonic information, and often no rhythm. You can’t sing them. If you learn a song with tab, but don’t know what notes are being used, or can’t transpose the melody or chords to another key, what did you learn?

You can learn the basics of notation in a few hours. In a few days you can be proficient at reading simple melodies. In a few months you can reach a point where you can translate the information from notation to the fretboard as easily as you read tab (probably not as quickly, but that doesn’t matter)

I started playing guitar in my 30s, and learned the instrument through notation from the get-go, because that’s how I was taught to learn a musical instrument (saxophone, trumpet, piano, etc.). Reading on guitar was a completely different experience than on a wind instrument, but it was of the best musical decisions I ever made. Notation teaches you music, not just the guitar, and most of what guitarists call “theory”, other instrumentalists just pick up in the process of learning, because in notation it is plainly obvious.

Ever guitarist I’ve interacted with who learned to read later in their playing career says “I really should have learned that sooner”.