If Titans are meant to be the melee class, why does the "1-2 Punch" perk not work with most abilities?

Not so long ago, a change was introduced to prevent any class from activating a melee ability after shooting during a slide. I'm sure many remember the Arc Surge Warlocks with Dead Messenger causing havoc. However, this change killed one of Titan's best burst damage PvE combos whereby you could slide, shoot a 1-2 Punch shotgun and melee before the slide finished. This would allow you to x2 the damage of your shoulder charge and combined with Synthoceps or Wormgod Caress made for a singular but very high damage melee attack.

Many moons ago, I believe just after the release of the Duality dungeon, a change was also made to prevent most* ranged melee attacks working with 1-2 Punch. This severely hurt, but didn't quite kill the classic solar "bonk titan", using throwing hammer. I don't disagree that this playstyle was broken, but I do disagree with the more recent hammer cooldown on pickup tacked on.

To help illustrate my point, I've made a list of all the melee abilities that work with "1-2 Punch" on Titan:

• Frenzied Blade
• Grapple Melee
• Shiver Strike

On shiver strike - just don't, the damage is pitiful.

So the only way to effectively trigger 1-2 Punch is with Strand. Strand is one of the strongest setups and I fully agree that 1v1ing Pantheon is silly. Impressive, but silly. But the point I'm aiming to make is that not one single void, arc or solar melee works. They're all either classed as ranged or have too long of a wind-up. Strand only works because you can do it standing still

*most : Solar hunter can still take advantage of 1-2 Punch with most / all of their throwing knife abilities, despite being ranged