Right, exactly. They are both tools for communicating music. I am glad to use both. What I don’t get is the notion that once you learn one that the other is inherently bad.
There’s nothing wrong with either. They are conveying the same information, pretty much equally well (for modern tabs). Tabs convey slightly more info actually (the suggested fingering, with the note being indirectly implied) while standard conveys the note itself without fingering hints.
Standard is a slightly more elegant notation but since it represents probably less than 5% (and likely much less than that) of the available bass resources out there for learning songs, there’s no point in shunning tabs once you learn it.
Likewise, apropos to this topic - sight reading on bass. Sight reading is a useful skill if you find youself frequently with sheet music for bass to read. It’s kind of axiomatic. If you often have sheet music for the bass and the need to read it, sight reading will be a useful skill. If not, it will be a nearly useless skill. So this is very, very goal and situation specific.
Now. As for learning to read music in general - everyone should do it IMO. It’s not very difficult and it will serve you very well as a fundamental skill over time, even if not necessarily immediately for bass.
But sight reading for bass - definitely situational. A great skill to have - necessary in many cases - if you need it; music student, music pro, gigging with lots of bands, session musician, etc. On the other hand, it is useless as a practicality if you don’t regularly have the need (or genre-opportunity) to read sheet music.
For my own case I have played several instruments over the last 40 years. Of all the instruments I have played I have only sight-read at speed for one (trumpet), because I needed it at the time, and haven’t needed it again in decades. I remember almost nothing of that instrument at this point. I definitely don’t need sight reading for bass. I do kind of want to get there on keyboards though.
At the same time, I have used the ability to read music many times in that time period. I have definitely used it with bass in evaluating and extracting information from scores for other instruments to figure out basslines (even if the score did not contain the bassline.) Sight reading is not necessary to get value out of reading music.