Stopwatch and zhonyas/guardian angel should share cooldowns

Was in a game recently where the enemy mid laner had zhonyas + an additional stopwatch, and the adc had guardian angel + an additional stopwatch.

This shouldn't be a thing.

The item was designed as a quick window of invulnerability - not multiple windows of invulnerability so you can basically just zerg your way through a fight.

You should not be able to fight - zhonyas - fight - stopwatch - fight, or fight - GA - fight - stopwatch - fight. Its just ridiculous. You basically can't focus the target down.

I present the following solutions (pick one):

1.) Using stopwatch disables GA/Zhonyas for 15 seconds 2.) Owning a completed zhonyas/GA disables stopwatch in the store 3.) Procing GA or using Zhonyas breaks your stopwatch 4.) Procing GA or using Zhonyas locks out your stopwatch for 15 seconds

Also, I haven't ever seen it done and I'm not sure how it works, but what's stopping someone from having like 3-4 stopwatches in the midgame? Can that happen? Just stopwatch your way through a teamfight. With games as short and snowbally as they are right now, having a fed 3-item mid laner with multiple stopwatches could be powerful enough to win you the game.

I surely hope the answer to that is "no, that can't happen" but as far as I can read for myself, there's nothing stopping anyone from owning/using 3 stopwatches at once.

Rito plz.