I know what you mean although I do think you made it kinda confusing saying that you won't hit harder than your first day in the gym. I think every one has a maximum power and speed. All they can do is get as close to their own maximum as they can.
I truly believe nothing can make a fighter faster or heavier handed, a good example of what you said is most of Bernsteins fighter's like Lopez and Jmm etc. more effective but no change in handspeed or power usually comes with experience and hard fights I believe you are correct over time it's been proven handspeed and power are born traits but there's many amazing fighters who overcame that hurtle with skill and timing.
Any physical attribute can be enhanced through physical training, and perfection of technique. You can increase hands speed, and punching power, but it's all relative. You can not create a puncher like Julian Jackson, and you can not create the hand speed of Meldrick Taylor. You can take an athletes natural born attributes and improve them, but you can not create a puncher, or exceptional hand speed. I myself like punchers... the exceptional kind. I don;t know where it comes from, but some guys can just crack. I have an amateur I just started working with 5 months ago. 5'9 114lbs, and this kids could knock your head off. Skinny as a rail, but can punch a ton. His punch was obvious the first time he hit the bag, and pads. A natural puncher. Now over these 5 months i have taught him how to punch properly using proper body mechanics, and now he is punching at 100% of his ability. See the gift was already there. I have also been doing medicine ball throws with him and that has helped as well. The point being though is that he was already a puncher. All the things I taught him would work for anyone, but because he was already a natural puncher the results are much more dramatic. I just maximized his natural attributes.
Saying that everyone has a different ceiling is way different than saying no one can improve their speed/power
Was waiting for Hearns ta show up, cb. Say he's the poster boy ta make the case for mechanics. Ain't true. He could crack from day one at Kronk, 'n everyone in the gym knew it. Boxed Olympic style in the amateurs -- points, points, points.
They make a guy throw a medicine ball better 'n have more bounce, bb, but it doesn't translate to punching power. Katsidis would be knockin' over buildings, if that was the case. You bang like Donaire or you don't.
For anyone to say that no boxer ever hit harder then they did the first day they entered they gym is absolutely ridiculous. I can take anyone in the world into a gym, have him throw a punch, and in 60 seconds I can have him throw a harder punch. In fact the simplicity of doing so makes this posters all the more absurd.
The importance of technique does need to be mentioned only Foreman was effective with arm punches, learning how to put my body weight into punches was incredible when I was young when I learned the stance and pivoting on the ball of my right foot while twisting my hips and basically the whole right side of my body all in one motion and hitting the bag blew my mind I never imagined I could hit with such force, my trainer and his brother were great at instilling the fundamentals I believe mastering the basics are more important than most anything myself.
I am saying -- working 24/7 for years -- ya don't improve hand speed 'n power, Sp. Sadly, there's no Santa.