understanding, examining and choosing are all thinking based. and that's why stoicism isn't really working well for humans. emotions are neuropsychologically lower level than thoughts/logic/ratio. having said that, lectures about stoicism might well be excellent instructions for language models on how to handle communication with humans.

Part of practicing Stoicism is to bring emotions up to the understanding, examining, and choosing level. You still have emotions, but you don't let them control you.

I love JiuJitsu because many parts of it are like microcosms of life. The first time someone lays on you and you feel like you can't breath, you panic. That's an emotion. After a few times you realize you can breath and eventually you will feel the panic and instead of succumbing, it'll wash past you. By practicing feeling emotions, especially negative ones like being uncomfortable over and over, eventually they move into your higher level thinking and no longer control you. You absolutely still have them, but your reaction to them has changed.

It's more to separate the feeling from the reaction to the feeling by a layer of understanding & examination. Feel first, understand the feeling, examine whether the feeling is appropriate for the situation that caused it, determine how to react, react. It's an OODA loop applied to one's own emotions: Observe the feeling, Orient on the situation, Decide on a response, Act as decided. If you pre-decide to always suppress any reaction you're missing the point. Stoicism is quite similar to modern Cognitive Behavior Therapy. If you just react without thinking you'll often react to your learned habits rather than the actual situation at hand.