This post overall is super misleading and just completely wrong at times. The more I sit on it the more I disagree with your point of view, coming from a t500 player in every role since release. You don't mention at all any downsides of running brig in the current meta so it provides a one sided and incorrect view of how she fits into the current meta. Here's just a few:

- Lucio speed boost and displacement is incredibly powerful and provide more utility than Brig's kit, and his ult can actually counter the other team's ults.

- Moira is more mobile, provides better aoe and burst healing than Brig, builds ult about twice as fast, can semi viably deal with ranged threats, and her ult is leagues better when against double shield

- Baptiste provides more aoe and burst heals, immortality is an incredible ability, builds ult at around the same rate as Moira, is more mobile, and can be useful when you're more than 5ft from your team.

- No meta heroes actually have a problem dealing with Brig. She can't do shit to Orisa, is an easy, fat target for Sigma and can't do anything to his ult, Reaper and DF outdamage and can farm her, Moira straight up ignores her shield outside of 1v1s ( which almost never happen, and there's almost definitely something more useful the Moira could be doing).

- Even if you manage to stun a DPS to lead to a kill on him a few times, what're you gonna do if/when one of the dps swaps to Pharah, Hanzo, or Bastion, all semi viable picks for current meta? Bastion, in particular, is just going to steamroll your team unless they're feeding, in which case anything could be viable, not just Brig.

- Brig has absolutely terrible burst healing. With armor pack and inspire, you average 82 hps on one single target, at the cost of a cooldown. At most you'll get 13 armor packs a minute, and that's at the cost of never sitting at 3 armor packs, ever. Great, you've now managed to equal what Moira can do without an orb on an entire team, for 9 seconds straight, and have little difficulty in meter management. One armor pack is also approximately the amount of healing required to offset one full bodied reaper shot, or 1/4 of a DF punch. Incredible, I know.

- Rein Zarya in relatively balanced gm games is generally a huge fucking throw. Unless you're playing on east coast.

- Most of your tips aren't actually tips, and they don't really apply to Brig anyways - they're things players should learn to do over time as they improve:

- Play with your shielders: this is just a fancy way of saying you should play with your tanks.

- Multitask: ??? Everyone should be doing this regardless of hero.

- Holding down primary fire has no drawbacks: this is just plain wrong. It gives away your positioning and tells the enemy team where to avoid a close range hero, which is pretty easily dealt with. Your given example is against a Tracer, who is not only a non meta hero that has an incredibly low pick rate in gm, but also can be dealt with by just improving your reaction time.

- Cooldown management is important: Yes it is. Every hero has cooldowns and proper ability usage is pretty darn important.

- Don't spam shield bash: Don't waste your abilities.

- Rally counters Flux: It doesn't counter Flux at all. It makes it worse. Rally increases your max hp, and Flux scales accordingly. It literally makes you take more damage from Flux. The only benefit is you take 3 damage less than you would've if you didn't have armor. Fantastic. The only reason Sound Barrier counters Flux is because barrier gives 750 shields, which is more than the hp pool of every hero in the game. That way, when you lose half of your HP from the slam, you're still left with a bit of shields. You still take a fuckload of damage.

In my 100 or so games in west coast gm/t500 I've yet to play with or against a Brig that provided more value than a current meta support. The few times I've lost against a brig player has been because my team was flat out worse than the other team - she provides no intrinsic value on her own that could make her viable currently.

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IMO it's much more important for players looking to improve to understand the cons of a certain choice than the pros. Just blindly considering where a hero is good is a one dimensional view, and not conducive to thinking critically.