Not sure what you mean by bypass charging. When an iPhone is plugged into a charger, the power management unit will direct power to the battery and supply current to the processors, radios, screen etc. If the attached charger is of insufficient power to both charge and supply the necessary current to meet demand battery power will supplement the charger. Once the battery is fully charged, all power from the charger is routed to the components to meet demand.
Heat is a byproduct of gaming. Apple's PMU definitely manages battery health and other needs of the device. If you're noticing that your iPhone is plugged into a charger and your using your iPhone for a high demand app or series of apps and the battery charge is going down, the charger and/or cable is not capable of meeting the demand. Depending on the model iPhone the minimum recommended charger is 20 watts. I use a 60 watt charger and experience none of the issues you refer to. But my charging habits, applications are probably different from yours. A possible scenario is would be plugging in your iPhone wanting game and selecting high frame rates, highest quality graphics etc. and having a battery in need of charging. A high capacity charger would charge the battery at a fast rate, gaming would activate the GPU's and CPU's and streaming would use the radios. Combine this with a battery being charged and you have a device capable of producing a lot of heat and subsequently dimming the screen and throttling the processors. You can avoid this by using an external power supply that attaches to MagSafe or via cable and keeping your battery topped off. Use optimized charging and keep the battery charged to 80% or higher. When you want to game or use other high battery capacity apps, the charger will 100% of its power to the components and not produce heat fast charging a battery.
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