One limitation of ATtiny85/Digispark being small and inexpensive is that there is no hardware UART.
The ATtiny85/Digispark coupled with the Arduino IDE for programming enables "simple" projects to be developed quickly and easily deployed for a few dollars in total.
Particularly when considering that an ATtiny85 on a Digispark "development" board can be purchased from ebay for ~$1 (which provides a surface mounted ATtiny85 with 5V regulator and PCB tracks to enable insertion into a USB socket). In this scenario the ATtiny range of microcontrollers are advantageous in terms of physical size and cost of the GPIO/onboard peripherals available. While many applications require a "myriad" of GPIO's for controlling various outside peripherals and or input from sensors (and hence need "larger" microcontrollers with multiple ports), in the DIY arena there are also many occasions where there are only a couple of inputs/outputs required to be controlled.
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