You can or you can be happy with the equipment you have. It's a personal choice but for me it builds the upgrade flame. If you buy it right the first time chances you'll die before you need or want to change anything. Having a well balanced system that works well together and serves the music and you're done. My system doesn't do fireworks but it plays music well or well for me. I bought my system in the mid 1990's the only thing I do is changes caps and bias the amp every 10 years or so. Someone willing to do that can play it for a lifetime.
Upgrading amplifiera.
A number of audiophiles upgrade their amplifiers. Is this a futile quest for the holy grail or are those upgrades a smarter way to dramatically improving the sound then purchasing a new one.