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Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Peter Parker is proficient in martial arts before getting bit. How would this change the MCU?

MCU Peter Parker is known for being very involved with extracurricular activities. However, what would happen if a few were switched out with something physical?

**SCENARIO:** All throughout his young life Peter loves the subject of science and is an excellent student. However, it doesn't bode well with the bullies. After 6 year old Peter gets bullied one time too many, his Aunt and Uncle decide to enroll him into a karate dojo so that he can defend himself.

Though he did it out of necessity , he soon developed a love for it, eventually working his way up to become a black belt champion winning several tournaments. After that, he gets into boxing after seeing Rocky.

Uncle Ben still dies. He still gets bit by the spider same time as in canon.

By the time he gets bit, he's heavily experienced in both areas.

Tony Stark comes to recruit him, and they go to the Airport. What changes from here on out? How would this change Peter's character? How will the MCU change?
gpt
Peter is generally more disciplined and mature in combat.  Yes, there's still the factor of geeking out a bit because he's involved in super powered fights, but less so now that he's grown up with close to a decade of martial arts training and experience.

Spidey stands a serious chance of beating Cap in their 1v1 at the airport.  Cap in canon won despite Peter's strength due to sheer experience and skill, but with a more trained and methodical Spidey he could potentially lose.  I'll assume Spidey wins, because if not then the rest of the MCU proceeds pretty much the same.

Cap is captured and brought to the Raft.  There's a chance Bucky is killed, but it'll be harder for T'Challa to justify it to his teammates once they've gained the advantage, so more likely he'll be imprisoned as well.  Rhodey is not injured since it doesn't get so far as chasing the Quinjet.  Tony at this point already has been told about "the doctor" and the other Winter Soldiers and still receives the info from Berlin police, so he goes to Siberia alone.  Worst case scenario Zemo still shows him the tape, but without Cap and Bucky there Tony has time to calm down and explain his anger to Cap later in a more rational manner—Zemo's plan fails unless he has another contingency.  Cap's probably still imprisoned for going against the Accords for a while at least, though without Team Cap being fugitives and feelings being less harsh, Team Iron will be more likely to negotiate for their release and more friendly amendments.

Peter is more quickly accepted as an Avenger by Tony due to his success at the airport and generally improved discipline from his canon MCU equivalent.  There's a chance this means Vulture's gang gets overlooked, but Peter still cares about the little guy where that probably won't be the case.

When Banner returns followed by the Children of Thanos, the Avengers are more readily able to respond since they're not split.  Thanos' children don't make it back to Titan, as Thanos quickly discovers after obtaining his first four Stones.  He might stick around long enough to clown the Guardians, but will probably make his way to Earth soon.  According to Word of God, the Avengers would have won in IW had they not been broken up in CW, so they defeat Thanos together, and the Snap and Time Heist never happen.

Tony is alive, so **FFH SPOILERS** >!Quentin Beck's plan doesn't take off.!<

EDIT: Also, to venture into crossover references, his personality may more closely resemble Robin’s.  Dick Grayson’s basically Peter Parker with confidence instead of spider powers as it is.