Your iPhone is a great mobile hot spot, but there are a couple of important considerations.
1. WiFi Speed may be slower than your home WiFi Network (although certainly not aways an issue)
2. Your Battery will be depleting faster in that your iPhone is working to provide a WiFi Network for your other device on a full time basis (if possible keep the iPhone connected to AC Current while used as a hot spot).
3. Depending on your Service Provider Data Plan you may be going through whatever your Monthly thresholds are much quicker than when only being accessed by your iPhone.
Otherwise it would be difficult to suggest you would opt out of using this capability due to decreasing your iPhone Battery Life. While the battery is not thought to be "user changeable", Apple certainly offers a Battery changing service and third parties offer Batteries and Kits to change your own Battery. (Not something I would want to do).