It's 2018 and Association is still an option because ZWave has good backwards compatibility. However, since ZWave Plus, the old style of Association has been "enhanced/replaced"
An all local hub like Hubitat should be able to mimic the functionality of old style association, even on Eaton/Cooper. You're likely to have a pretty non-chatty ZWave network with the older devices and thus the doubling of packets to mimic old association may not be detectable. (Old = packet from trigger to target; Today = packet from trigger to hub and then hub to target.)