Horwath
Legend
Yes, they can.If you don't have a fighting style, the right style for you can be a bigger bonus than a +1 to hit/damage. TWF rogues who now can add +DEX to their offhand attack. Any ranged weapon attacker could want Archery. And so on, especially with all the new Tasha's options.
But I do not see any scenario where my rogue/bladesinger will take a fighting style(archery/dueling/TWF) before having 20 dex.
Then the bladesinger has Resilient:Con to take then you need intelligence. So, no room in 20 levels for this feat.
As a rogue, you could get it at 10th level if you want to delay some better feat for it.
there is none directly. But this style is a clearly different than any other.Then you have cases like you find yourself at higher levels fighting lots of invisible foes and want to get Blindfighting. Where it's orthononal to your ability score.
and you can have it better with a see invisibility spell/potion.
at low levels, there is not many invisible threats and at higher levels there is many ways to counter it.
TWF can be OK for a paladin. great weapon style is soo bad that I would not take it even as a 3rd style option. while using 2Handed weapon always.Also this grants ones the Fighter class can get. Sometimes you have concepts like the TWF paladin or the great weapon ranger that need a different fighting style than is available for the class.
Also classes like fighter and rogue get extra feats - this is a great feat to take once you have your 20. And that's well before the campaign ends. Campaigns that roll ability scores will also have people in the same boat. Or maybe you're playign a vHuman and need a feat - taking an ASI isn't an option.
problem is, that is at least 5 better feats that you would take for any character at 1st level instead of extra fighting style.
And that is a main problem here:Each of these is a marginal case, but taken together it is a feat that is a solid add - there are enough different circumstances that can come up that it's the right move. It doesn't have to be "better than an ASI for everyone" to qualify as a good feat - those are usually considered overpowered.
And finally, work this backwards - this plus a half feat gives too much. And that's just as easy to plan around an odd number just like casters taking an odd CON and going for Resilient.
If you are designing a combat oriented feat, and it does not compete with GWM, SS, CE, PAM, Lucky, do not bother to design it as a full feat.