Except when you notice that some basses with a B that sounds better or worse with the same hands.
I'm talking about B's that genuinely suck IMO. Better or worse is a very relative grading. If you have a B that performs phenominally IYO and another that is great but not as good as the former, it could be deemed "worse" even though it's by no means anywhere near being negative.
I'm saying that the vast majority of B strings that I've come across that people have described as floppy/sucking/etc.
didn't when I played them. Largely because I also figured out a long time ago not to try to play any bass as
my ideal of an ideal bass. That makes about as much sense as setting the EQ on a new amp like you did on a previous different amp and expecting identical results.
Instead I play the bass I have in my hands, meaning I gear how I play towards that specific instrument. I figure out what I can get away with technique and I'm home free from there.
It's the same old thing that I learned decades ago: if something that you contend sucks sounds great in someone else's hands, did it really suck?
Here's the situation: Sax player in my first real band, in high school. Parents bought him several Selmer tenor saxes, all of which he was positive had problems. That's why he had the tone he had and difficulty playing his parts. At a rehearsal he told the same thing to a new sax player who was added to our band who had more time under his belt. The new guy asked to check his current Selmer out, played it and it sounded GREAT.
We looked around and the consensus was "Well... guess it wasn't the sax".
I've yet to see an actual B string performance issue that couldn't be remedied by setup ( be that string height, pickup height, neck relief, etc.), strings or touch. I don't consider bad fretwork to be a B string issue... that can affect any string.
As far as EQing to help a B string, you can do that or you can do what many still haven't figured out: turn up your amp and watch how you set your volume on your bass... it matters. If you start out without boosting your bass or treble you can get a similar effect and even have your mids along for the ride if you simply turn your amp up. But that's not a B string specific remedy either IME.
These are just things I've figured out over the years and demoed to people countless times IRL.