Yeah. People are asking questions because HIS questions are, when taken together, nonsensical.
He's looking for a good host machine to do development for ARM, MSP430, and other MCU embedded targets.
When doing embedded development, there is usually a very clear distinction between "target" and "host" - it is rare in the embedded world for people to use a device as both host and target (since the target is usually pretty weak CPU-wise), but he's implying that he wants to use a device that is usually a target (Raspi, BBB) as a host... Which to anyone that has actually DONE this sort of development is nonsensical. There's some benefit to a BBB self-hosting, but it's silly to do AVR or MSP development on a BBB, unless what he's really looking for is a heterogenous target (e.g. the BBB is part of the target solution, and loads an AVR or MSP at runtime to do realtime tasks - but even this doesn't really make sense due to the BBB's PRUSS, other than the fact that the PRUSS is a bit more difficult to work with.)
If you want a low-power low-cost development environment for ARM Cortex-M, AVR, MSP430, etc. targets, your ideal host system is probably a Chromebook with crouton installed on the SD card.
So either he has VERY special unique requirements that he hasn't clearly communicated, or he's looking in an entirely wrong direction for solutions. Either way, his actually needs haven't been properly communicated.