Bikes are good enough, but carbon manufacturing quality is inconsistent in the industry. High quality frames should be expected to last decades of high mileage hard riding even for heavier riders. But more so than QA I think improvements to training are the best place to look at. I think the likes of Zwift have been a massive success and I’m eager to get an indoor setup of some sort going to help improve my IRL riding ability. Better tech and coaching aids out on the road could also factor in.