The most common consumer bikes aren't meant to ridden aggressively. Even those suffer from perpetual incompatibility due to trends. Compare that to something l

The most common consumer bikes aren't meant to ridden aggressively. Even those suffer from perpetual incompatibility due to trends. Compare that to something like Toyota Carolla or Honda Civic. Parts are often interchangeable across model years. There's a huge stock in junk yards. A decent off road bicycle is niche in comparison. Every 2-3 years some new standard is introduced. I wouldn't trust my safety on a used bottom bracket or crank arm. Who knows what kinds of insanity the previous owner was involved in?