Wi-Fi and Bluetooth both occupy a section of the 2.4 GHz ISM band that is 83 MHz-wide. So, Wifi and Bluetooth are twins at core but different personality. Unfortunate part of bluetooth is gadget manufacturers implement standards differently causing everyone pain.
Wifi is also getting good at low energy with better range than bluetooth. With new wifi low energy wifi chips now on the market that handle all the network issues of an IoT device.
So how long is it before they collide and wifi start eating Bluetooth's market?
In big devices like a tablet and large phablets, I don't think BT has much advantage.
It's in small extremely low power IOT (with small power supplies) that it still has an advantage.
But, in the end, it's more how it manages the connection that differentiates in. They both have their use.
Yet another indicator the headphone jack is going away. BT 5 could possibly be the improvement Apple has been waiting on to go reliably wireless and address convenience issues with pairing devices.
Blue Tooth pairing is slow and unreliable, not sure why its such a PITA.
Bluetooth is unreliable because it's wireless. Wireless is not efficient. Wireless is subject to interference. Wireless drains the battery the more noise it has to deal with.
This is the main objection to dropping the headphone jack. I do not want wireless earbuds/headphones. That is yet another set of batteries that need to be charged and wireless signals going through your head.
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It's in small extremely low power IOT (with small power supplies) that it still has an advantage.
But, in the end, it's more how it manages the connection that differentiates in. They both have their use.
This is the main objection to dropping the headphone jack. I do not want wireless earbuds/headphones. That is yet another set of batteries that need to be charged and wireless signals going through your head.