I used ZFS with Arch for a while, the volume manager was what I’d call the largest benefit; in my opinion nothing else comes close to being as useful and well integrated.

I stopped because ZFS incompatibility with recent kernels (which I needed for GPU reasons) made me have to rescue my system more often than was ideal.

Some other minor downsides:

• boot can take ages due to ZFS using udev-settle.
• deduplication status is… Complicated.
• you’re kind-of stuck with the performance of your slowest vdev; L2ARC & a metadata device don’t really compensate well for a zpool that is predominantly a raid-z2 of spinning rust.

In addition to the downsides mentioned here about privacy regarding Google, there is a major upside to using this service: it offloads all of the authentication logic to google, so in theory it reduces your risk surface area, or it may be more accurate to say it concentrates your risk to your Google account.

You’d like to hope most websites use using common security best practices and keep on top of things but the amount of websites I had accounts on (on websites I had long forgotten) which have been pwned over the years tells me otherwise. Using google auth sets your account security to be exactly as secure as your Google account.