That role can be filled by just drinking an invis potion, any of the several classes with the invisibility spell, shovel, an invisibility scroll, or an item that allows it. I don't agree with that being the panthers primary role.
Except other means of invisibility require spell slots, limited consumables AND also all have durations.
The only other ways to fulfil the same role is with Quasit/Imp familiars.
In regards to its primary role... It's generally the way things are with all the forms. Like, Bear's primary role is to Taunt stuff away from the party (Since Owlbear can also be big and beefy). And uhh... Oh right, Badger/Spider/Wolf don't even have a primary role other than "You're a Druid below level 6"...
I mean, that's the general point behind having access to many forms though, rather than having like 100 "Jack-of-all-trades" forms, you instead get 100 niche forms that do a specific task well (It's just that really, Owlbear and Saber-tooth are Jack-of-all-trades forms being both pretty tanky AND having good damage making them the de-facto combat forms outside of eventually using Myrmidons)
Of course, extending forms more niche roles would be nice (For example, instead of Panther being just about forcing Surprises a bunch, it functions more like Gloomstalker and provides an extra benefit from doing so)
Though, such things are more directed towards WotC and its source material (Unless Larian wants to homebrew yet more stuff...) to which I have many ideas about many things, all of which are pointless to express because WotC lol.
