Why do ADC's carry Swords?

There are probably like only 6-8 meta marksmen available at once

2 already use reloads, so I only need to think of 6 to 4 different ways, maybe even 2 - 4 and leave the rest as the same so half of the roster is reload and the other is normal

1. Champion can't shoot while out of ammo, each auto is powerful and takes 'ammo', has an ability that refunds cooldown when last hitting and is free. Only kills, assists, backing, and time out of combat replenishes ammo rather than in all in 1 reload.

2. Champion can shoot an infinite amount of times like a normal marksman but only on a single target designated with a passive similar to Kindred's marking system. Marking another target takes 2 seconds of being completely unable to attack but still able to move and use abilities. Attacking someone other than the marked target requires a 0.3 second reload between each attack plus delay from attack speed.

3. Champion can switch between a reload system and a normal system, the reload system restores health on attack while the normal system restores energy on attack. Their DPS is nearly the same but the reload system allows hit and run since the damage is more front loaded while the normal system does much more DPS as it allows extended trades by adding in damage from abilities too.

4. Champion can only make one attack then reload for 1 second but that one attack is high ranged and an execute (actually different from Jhin who uses his first 4 short ranged attacks and the fourth happens to be an execute), attack speed is converted into cooldown reduction that does not contribute to the cooldown reduction cap.

5. Champion has only 10 arrows that regenerate upon using any ability. Relies on comboing well and using abilities the moment they are off cooldown while never over capping on arrows.

6. Champion only has one attack per five seconds scaling down with attack speed but it deals %current hp scaling with AD/AP and can use melee attacks afterwards. (Kind of like poppy actually)

7. Champion is melee who attacks with a stone that is harmless unless charged, attacks against minions do not discharge the stone. Each melee attack on a champion requires 3 seconds reload but chains to other nearby champions like statikk shiv.

Meanwhile, let's see how many different infinite auto attack gameplays I can create without them feeling the same:

1. Champion can right click another champion to launch a projectile with a delay on each projectile scaling down based on attack speed

2. Champion can right click another champion to damage them with a delay scaling down based on attack speed