I'll probably get smacked for crapping on the game we all love but its how I feel. Low Profile/Fortified is not based on hitbox size like some say because the nerf/buffs are all over the place.
Smallest to largest hitbox:
Wraith – 33 square cm (Low Profile)
Bloodhound – 37 square cm
Lifeline – 37 square cm (Low Profile)
Wattson – 37 square cm (Low Profile)
Octane – 38 square cm
Bangalore – 44 square cm
Crypto – 44 square cm
Mirage – 44 square cm
Revenant – 58 square cm ((guess)) (Low Profile)
Pathfinder – 63 square cm (Low Profile)
Caustic – 68 square cm (Fortified)
Gibraltar – 79 square cm (Fortified)
They're using the nerf on OP legends and the buff on the two weaker ones. Instead of changing how much damage they receive, I'd rather see a change in abilities, passives, or cooldowns. Use one of the many examples this subreddit has given to buff or nerf legends. We've all seen them.
Side note – I know calling Gibby a "weaker one" will make some people LOL but I don't care. His gunshield nerf does lower his effectiveness in a big way, exposing his massive hitbox. A perfect example of what Respawn should be doing instead of throwing around damage nerf/buffs.
Source: https://www.reddit.com/r/apexlegends/comments/ff27dp/low_profile_and_fortified_are_lazy_ways_to/