I'd like sneak and invis spells to be taken out of the game entirely if mob detection by sound/sight were to be maintained in FFXIV.
sneak/invis often did more harm than help. ppl find their fastest way to battle areas, mob spawns, and ignoring everything in between. missions/quests end up being "just getting there with sneak/invis by yourselves" rather than "adventure in a group".
as ppl relied more heavily on oils and powders in XI, mobs between the start and the "goal" are often untouched and ppl just stealth their way through zones. ppl would get left behind, get lost, die, and was just a big mess. you just miss out on all the other stuff in the zone, whether be it the environment, the mobs, or the routes through the zone. ppl could just zip through XI zones with sneak/invis and not knowing anything more in-depth about the zone.
of course the above is just a general statement, and does not apply to all zones/quest/missions, etc.