Wealthy knight bombs:
-Chaos/black kat set with health trinkets and fire/shock UVs = strangely durable "glass" cannon
-CTR UVs + heat level 10 = able to spam bombs and combo bombs with other weapon types
-5* = large radius that gives them legit crowd control
-Access to dark retribution = some single target damage
Poor knight bombs:
-Chaos without trinkets or fire/shock UVs = very glasssy glass cannon
-Bomber armor = no damage increases = limited mostly to support
-Not-Volc demo bomber armor = less ctr increase wrong choice gg
-Non bomber armor = zero ctr good luck have fun
-Under 5* = mild but not fantastic charge time reduction.
-Under 5* = radius is smaller, less of an effect etc.
-5* = Probably not heated missing at least one level of CTR
The effect is there with swords and guns too where guns become more or less charge focused and who hasn't heard of brandish spam but those have normal attacks as well so you're at least able to do that.
I understand your point, but let's look at a poor bomber:
* Volcanic Demo helmet and suit (heat level 1)
* Swiftstrike Buckler (heat level 10)
* Dark Briar Barrage (heat level 5)
* Voltaic Tempest or Ash of Agni (heat level 5)
Defense is okay. It could be improved with a better shield. Offense is ASI+3 and CTR+5. VT/AoA is spreading status admirably. DBB is doing low damage, but I suspect (without having detailed unheated damage tables) that it's more because of heat than because of damage bonus. If the damage is too low, then he swaps out DBB for a vortex bomb. And none of this includes the sprite perk: bomb CTR, bomb damage, or MSI.
I agree that this loadout doesn't show off the full power and utility of bombs, but it's good enough that even poor players should try bombing, especially if they play in a party.