no, not the Linux Drive client specifically: it's how Google prioritises all product development. You can see it's evident in the way they used to release updated, e.g. go back 2 years they released to iOS first, then Android as iOS had a far bigger userbase, now they release to both simultaneously as the userbase on both platforms is very similar. We were specifically discussing Chrome support on Windows Surface and why was it so poor, because the usage is tiny (in Google terms) so Google do not prioritise for Windows Surface. If that's the case you can extrapolate that to Drive for Linux.
Look at the issues that both the Mac and Windows +Google Drive
clients have currently: +Google
need to fix them first before looking at a Linux client.
In previous comments people have said there's nearly 20,000 signatures in a partition for drive for Linux: well that's 0.003% of the Gmail user base (I don't know what the figures are for Google Drive usage), so as you can see there aren't many.