I would call it a design error.

I'm quite happy with the device and smiling that i have a linux system on my mobile phone. Anyway the issue with small rootfs is really annoying!

For me it seems that the device was never intensive testet before
production. Installing a few apps can fill up your rootfs within
the first day after purchase. Everybody is talking about the big
success of mobile apps and Nokia designs a Smartphone that ...

I'm using linux desktops since year and moved some folders to the
home partitition and so on ... but beside it's a bit risky ... it's for sure
not a solution for everybody!

Now i hesitat to start the update via app manager with only 54MB left.