You wouldn't be able to cap while invisible, but enemies were able to splash invi potions in you to prevent capping.

Those potions never truly had good impact, only good thing of such potions was the invisibility from map, that isn't much of a problem anyways, since crouching should already make you invisible on minimaps (as said by rules).

If they can stop invis capping then stopping people splashing invis onto people who are capping doesn't sound like rocket science

Afaik this shitty tactic was one of the reasons why invi pots were removed.

then why not hit them with highlighting potions if they exist here or hit them with spectral arrows

How are you going to hit invisible moving entities?
Afaik highlighting potions are not a thing.

Using a zep to completely invalidate any capping attempts with invis potions is dumb.

Ambushing people while invis has never been meta, or even viable on pvp servers

I dont get what zepps have to do with it, and also, if invis players can be stopped from capping, then it should be easy to stop people abusing this by throwing invis on cappers, just dont let people get invis if they're capping.

Also , there's a neat projectile called the flare for the mortar cannon which makes everyone in a big radius glow, i used it at socoa to highlight enemies to prevent friendly fire, but otherwise its totally useless, if invis was added then flares would become more important to expose invis people

The only possible answer for this is:
https://tenor.com/search/no-gifs
(You can choose the one you like the most)

What about this...

Invis pots are added, but you glow when you are near the banner (whether you have capped or not).

You still have to be tactically invis (for map), because when you have a compass in your off hand, you are limiting the ability to defend yourself (using larger guns), because you don't have both hands available. So, that means in order to be invis on map, you have to tactically invis. In order for you to go invis in-game, you use a pot (but cannot be invis in-game if you are near the banner whether capped or not). You can use both at the same time.

Thoughts?

If you are invisible in game why should you be visible on the map?

as you said "You wouldn't be able to cap while invisible, but enemies were able to splash invi potions in you to prevent capping.

Those potions never truly had good impact, only good thing of such potions was the invisibility from map, that isn't much of a problem anyways, since crouching should already make you invisible on minimaps (as said by rules)." maybe you are visible neither way so i guess just highlight the person and invis would be useful for not knowing who the flip are you talking to (i am child friendly don't bully me cause i don't want to be ban) or maybe useful for spying as the rules indicate leaking info is allowed so if in war something highlight 'em (p.s sorry for this message being long)