I'm still very sceptical about this new idea. Not that I can know for sure what they concretely have in mind, but in any case it simply has to be an upper limit of any abilities. It should be crystal clear that "better with each update" can impossibly mean to shift this limit higher and higher. That leaves the only other possibility, which is the more you reach this limit, the smaller any future improvement will be.
Sounds good on paper and if you've never played such a system. I did (the crafting system of Worm online, otherwise good game btw) and while promising a lot of freedom for the first few month it has a strong potential to burn players out while the fun factor unavoidably fades out. At some point the improvements will be so miniscule that the only reason to still go on will be just that it has become a habit at this time. Only the most disciplined players would be able to stop it at this point - which actually isn't really a point, it's rather something in the lines of "just this one last cigarette". You know how well this works... Looking at all the happy grinders here I seriously have my doubts.
And if the latter really is what's in the pipeline, you really should think about babel's last comment and talk to us and with us - before you change the Engineers into something that will turn out far worse than it actually is.
I still think people have got the wrong end of the stick when they say that an upgrade will always better then the last. I still 100% believe that they mean that a grade 5 will be better then a grade 4 upgrade. Not if you roll a grade 5 which is at the lower end, you then roll another grade 5 and it is guaranteed better then the grade 5 you have copied over. That doesn't make sense to me. If you re-roll a grade five, it is precisely that, a re-roll and it will still be random within the bounderies, so has the possibility to be worse then your current grade 5, it will just be guaranteed better then a grade 4.