While Blink really is great for fresh installs, it's worth trying to understand the reasons for going with a fresh install versus a CPUSE upgrade.
Something that many people don't know is that a CPUSE major upgrade actually behaves very similarly to a fresh install. The process creates a new partition on your device, performs a fresh install into it, then copies over your configuration, while updating it to the target version. You are not left with a mix of files from various HFs.
One exception where a fresh install does make a difference is R80.20.M1 where we've introduced a new file system, so only fresh installs (with optional export/import) can benefit from that.
If you still have reasons why a fresh install is preferred, we (in R&D) would be happy to hear about those.
Tagging Tsahi Etziony