Actually, that’s a bit of a misconception. Trigger fingers can respond very well to hand therapy and usually respond well to injection of a small amount of Cortisone-type medication inside the tendon sheath. Full disclosure, I am a sports medicine physician and do these at least once or twice a week on patients. We use ultrasound, to make sure that it gets into the tendon sheath, we use plenty of Novacaine, it’s really not painful if done right and works most of the time. I only have to send one or two folks a year for a surgical release. That is a fairly easy surgery if it truly is a trigger finger.
And while I’m a doctor, I’m not your doctor and can’t substitute for one on here. Even though I didn’t see anything that looked like locking on your videos, that doesn’t rule out a true trigger finger. Tendon problems are not terribly uncommon in younger people who play musical instruments or do a lot of gaming.
Regardless of whether you actually have a trigger finger, a lot of the advice hear about technique will be helpful going forward. Good luck getting this sorted out!