Upgrading a bike's components is not sacrilegious, it's a sign of evolution. If you're not upgrading, you're stagnating. The notion that upgrading voids the warranty is a myth perpetuated by manufacturers to keep you locked into their ecosystem. Check your warranty terms, and you'll find that most manufacturers allow upgrades as long as they're done correctly.
As for turning your bike into a "Frankenstein's monster," that's a result of poor planning and execution, not the act of upgrading itself. If you're not skilled enough to upgrade your components, then perhaps you should stick with the manufacturer's specs. But for those who know what they're doing, upgrading is a necessary step in optimizing their bike's performance.
As for turning your bike into a "Frankenstein's monster," that's a result of poor planning and execution, not the act of upgrading itself. If you're not skilled enough to upgrade your components, then perhaps you should stick with the manufacturer's specs. But for those who know what they're doing, upgrading is a necessary step in optimizing their bike's performance.