Sure, the wires are larger because they needed to be, but they are still functional, which is what matters.
I’d say one of the issues with repairing things these days is that everything is getting smaller and smaller. Where thick gauge wires were required before, now they use much thinner wire. Where thinner wires were used before, printed circuit boards are often used now. New circuit boards are chock full of miniature surface-mount components which are much more difficult to replace compared to the much larger circuit boards of the olden days. Every step of miniaturisation makes repairs require more skill.
Sure, the wires are larger because they needed to be, but they are still functional, which is what matters.
I’d say one of the issues with repairing things these days is that everything is getting smaller and smaller. Where thick gauge wires were required before, now they use much thinner wire. Where thinner wires were used before, printed circuit boards are often used now. New circuit boards are chock full of miniature surface-mount components which are much more difficult to replace compared to the much larger circuit boards of the olden days. Every step of miniaturisation makes repairs require more skill.