@Peri_Longbow_plz How I feel about knockdown shields is that they need their HP adjusted and protect more of the player. No matter what level shield I have, people can empty 1-2 mags and somehow cut through it like butter. It doesn't matter what gun they use either.
They're also even able to quickly run around the knocked player and hit them in the sides, back, or from above, rendering knockdowns useless.
Someone can also do a finisher, which bypasses the knockdown shield all together. If they don't want to wait the time or risk getting shot at, they can cancel the finisher and then shoot at you. Oftentimes this catches the knocked player off guard, and the finisher makes the knocked player put away their knockdown shield. This allows one to go ahead and kill the knocked player quickly without having to go around them or fight them through their knockdown.
Throwing thermite also goes past knockdown shields.
Unless you have a decent team that seems like enough of a threat to focus on, people should leave you alone and give you time to crawl away. This also requires 3rd parties to not exist or the 3rd party becomes the distraction for your team. Oftentimes, there could be 2-5 teams shooting, and for whatever reason 1-3 players of each team would focus on finishing you off mid-gunfight. It just makes no real sense.