I would further point out that the N2 has its EMMC on a removable card (which you have to buy separately anyway).
This gives you the same recovery opportunity with EMMC that other boxes with soldered down EMMC must use an SD card for.
Thus, even if you were to install a disastrous image or update to it, all you have to do is take the EMMC card back to your PC and flash a stable version onto it. (Hint: buy an EMMC reader/writer card from the N2 vendor so you can update any card you have on your PC/Mac)
In an abundance of caution I bought two blank EMMC cards and a reader/writer so that I could have a ‘safe’ copy I could just drop in if the experimental one turned bad. The minimum to be safe is one EMMC card and a SD card or USB adapter to read/write it. The spare EMMC is just for convenience.
Since even the u-boot is on the EMMC card, there is basically nothing you can do to an N2 (short of a hammer) that will make it unrecoverable. I know, when you make something foolproof, someone will come up with a better fool. But if you can flash an SD card, you can flash EMMC (with the adapter) and thus fix almost any mistake.