Why are pro players not building Tear?

The game is early focused no point picking a hyper scaling item when you can get early dmg and mana from morello and kill people in skirmishes. Jayce doesnt need it because rito gems buffed his monkey ass so he doesnt run out of mana in 2 rotations

Probably because they want to be more powerful around early-mid game where games are decided (mostly) atm. Tear won't help you get first turret or early drake control.

tear is overrated in casual elo especially bronze silver, as was with rylais, when people said its op, nobody in master , challenger and proplay never built it. Like people built it on ahri, but it was completely worthless item if you knew how to actually play ahri. It goes same with rushing hurricane on all adcs, but there are only 2 adcs who need it as second, for others, it actually gets you behind if you rush it.

Masteries now have decent mana regen. And they deal more damage, so they burn less mana on wave management.

Add in the new Morellonomnomnomicon. And they are fine without it.

My guess is that pro players make every shot count. They know the kits well, whereas one of less skill will use tear because they are flawed in using a champion's kit.

Because pro players manage their mana wayyyyyy better and don't need a tear.

They use auto attacks to farm and only use mana to push a wave and back or to try to get a good trade off.