I recall a few years ago, when seagate released their momentus xt hybrid drive (8Gig flash on back of 7200rpm laptop drive; before SSD's were consumer oriented), my dual core core2 duo laptop booted in 1/3 the time of my desktop with far more horsepower
Still an excellent deal for large space with notable speed increase on a laptop.
Evened up the score with a samsung 830 (still one of the best deals if still for sale) SSD installed on the desktop, 64gigs holds the OS and all binaries quite nicely. As with any SSD, leave 5-10% of the drive unpartitioned, it should extend lifespan of the drive.
I'll convert my desktop this weekend to systemd, but with the SSD holding the entire OS, the running speed increase was to place /home on faster drives with larger (64M) ram cache on the drives (raid mirror). Thunderbird is my current slow point, being single threaded, and with >500 folders and 15 years of imap email....well, fast isn't in the description (and none of the other imap clients can even handle >30gigs of email!).
As they say, all good things (like openrc) must come to an end at some point
Systemd reminds me of 2 decades ago when sunos (4.1) changed to sys-V solaris 2.0. Eventually, it caught up
As always, a big thankyou to the devs for hours of work in keeping sabayon top notch.