Such feeling is quite subjective.
To me, it feels different from iPhone 5s. And since its a new phone, and screen bigger, I'm using a combi of soft home and physical home button.
If it's working fine plus and if you have AppleCare, I would just continue to use it and don't think much. If Touch ID and button continues to does what it does... Should be ok...
Cos let say u use... 9 months later really home button loose n not working... U have valid grounds for a replacement.