IoT smart hardware why not use button batteries?

Internet of Things hardware is actually useful to the button battery, such as last year's more popular: Bluetooth finder, many of the CR2032 lithium manganese button battery. Coin cell batteries are only suitable for low-power smart devices, the reason I will say below,

Most of the other categories of smart hardware do not use coin cell batteries for the following reasons:

1, from the point of view of the reliability of the product: because of the internal resistance of the coin cell batteries is larger, the general discharge current is relatively small, so it can only be used for low-power devices, such as the front of the BLE (low-power bluetooth), if used for the Other Bluetooth audio devices & WIFI equipment equipment, because the working current is relatively large (Bluetooth headset work current 20-40mA), will lead to battery discharge due to the internal resistance is too large, resulting in low output voltage, the product can not work properly.

2, from the economic point of view: even if some manufacturers have developed a large support for high-current discharge (low internal resistance) of the button battery, but from the economic point of view, because the lithium manganese button battery does not support rechargeable, can only be a one-time use, if used in the audio class of equipment power supply need to buy button batteries frequently. (For example, CR2032 nominal capacity of 240mAH, if I use Bluetooth headset to listen to music, 20mA current can only listen to 12 hours of work, that is, I need to replace a battery a day, this case with a lithium-ion polymer rechargeable batteries, rechargeable recycling is obviously more economical).