So, I've got a Nexus 7 and would like to start expirementing with images, etc (primary goal being installing Ubuntu in multiboot with Android, probably loading from a flash drive over an OTG cable).
My main concern (and hence the question) is:
I've heard, that rooting, unlocking the bootloader and flashing ROMs involve some dangeorus operations (like "fastboot erase boot loader") that can render the Nexus 7 unbootable if something goes wrong (i.e. the bootloader ends up in a messed state or erased).
Is there always a strong guarantee (not "99 out of 100, I'd say, if you're lucky") I can get the Nexus 7 to boot an OS with software-only means (i.e. USB cable, PC, and my hands pressing the hardware buttons on the tablet) if the above-described scenario takes place (i.e. the bootloader is ruined and the device refuses to boot)?
I've discovered that there exist different opinions on that matter, with some (obviously quite experienced) people telling one should not really worry about possible problems during image flashing and alike operations, and still others seem to struggle with what appears to be a Nexus 7 hard-bricked after an unsuccessful flash attempt.
This thread is a story of several Nexus 7 devices (hard) bricked with essentially a wrong sequence of fastboot (or alike) commands.
This fresh thread bears an example of "a knowldgeble guy" telling everything can be fixed.
Please note: this question is specifically about Nexus 7, and not about unbricking in general!