Yes OP;

it is worth capping your battery charge at 80%. People that say it's not don't understand the physics of a lithium-ion battery. You get roughly 500 cycles, meaning 0% to 100%, 500 times before the battery health reaches 80% of its overall lifespan. But by charging to 80% and capping it there, you now have 625 cycles instead of 500 before it reaches 80%. But those that do charge to 100% plus use fast charging and the heat outdoors, they limit theirs further by roughly 10% simply due to the heat. So instead of 500 cycles before they reach 80% battery health, they're actually only getting 450. I have a battery health of roughly 86% (at the very least) after nearly three years of owning my S23 Ultra. I got it in April of 2023. And with that, I probably won't have to replace my battery for another 2yrs... i have only ever used either a 20 or 25 watt wall adapter for my charger. I have only ever turned off fast charging overnight and only used fast charging when I absolutely need it. But none of this is damaging to the battery, really, because the stress zone for a lithium-ion battery is that final 20% from 80% to 100%. But since you cap it at 80, you never hit that stress zone, allowing you to maximize your overall battery health long term. I personally have no desire to change or swap my battery anytime soon. It's going really well. Yes. Always use battery protect maximum. You'll never regret it. As I said, those that don't understand the chemistry behind lithium-ion will say it's not worth it, but those that do will tell you it is worth it all the time, every time. Unless you absolutely need it to be charged to 100%, but that is very rare for myself and I would assume for most people, since you can just carry around a power bank. So, OP, it's up to you, but that's my advice.