I don't need to light up an entire block, when would you need this? The flash is good enough for walking home, even in the forest, I use it to see ice patches in the winter.
But you could, right?
If you have one flashlight you'll be able to drain the battery and switch it out in time before it starts leaking.
pulls out power-bank
Flashlight will also drain, no matter how many you have, they will eventually drain. What then, hu?
put the phone down facing the flash up Also you need to hold most flashlights so...
Nah, I have one in the kitchen that I only use for traveling and emergency power. It's always charged.
I plug in the power-bank before that happens.
It's the same technology used to indicate battery health.
I fire up my old phone. I keep it charged for just such occasions.
90% of people know how to use a phone. And you still only need one flashlight in the kitchen. Again, how big is your house? Elderly and child accessibility is a good point tho.
What?
Dry your hands on your pants or/and make the tactile side button activate the flash when you click it.
So in this emergency scenario you don't want to be found?
You can charge the phone (with a power-bank for example), you don't need to throw it away every-time the a battery is drained. And you already have a phone, that's the whole point. No need to buy even more electronic crap and ship it around the globe.
put in wireless earbuds I'm out here listening to some guided meditation, trying to calm down because my hands all bloody for some reason. Hopefully they can triangulate my position using the cell towers. Right now I'm using the phone GPS to reach the closest road.
What do you mean quickly, you have to go to the store to get it. If I can walk to the store I can find an outlet to charge my phone. If I have a car, I can charge the phone (and the power-bank) from the USB outlet.
What? They're not going to brick your phone when you're using it. The flash doesn't drain processing power, wtf are you talking about?
So in this scenario, a unnamed shadow organization have hacked your phone, at the very moment you need a flashlight?
dubble taps the side button

Conclusion: Sir, I have demonstrated effectively and with high probability that 19 out of 20 possible tactical scenarios that could justify an array of Light Casting Devices can be condensed into a single form factor for easier deployment, accessibility and portability at a comparably cheaper price point than having multiple instruments and units deployed at the same time requiring less technical knowledge, serviceability and training to achieve the same results while using less resources to do so, sir!

Sir! This WILL increase mission efficiency, sir!