I have base Diablo 3 PC version, and am considering upgrading to Reaper of Souls. However, I haven't completed all of the older content such as Infernal Machine available in the classic version – and from reading online, I know that the parts dropped by the IM bosses change in RoS.
As such, is there any reason to actually delay a RoS purchase to e.g. farm quests/bosses/etc. that may be unavailable or changed in the expansion?
Best Answer
Another minor, but more permanent benefit, is if you sit at level 60 without RoS you will gain Paragon experience. Paragon levels give all of your characters a boost like +Resist All for extra toughness, Crit Damage, Attack Speed, etc. And the first few dozen Paragon levels require less experience than it takes to go from 60-70.
You would normally gain Paragon levels upon reaching level 70 with RoS, so this isn't a strong reason to hold off of the expansion, but if you wanted to buff up your alts and have an easier time in Act 5, it would be a side-perk while you work on the older content.
The biggest benefit to this delay would be for hardcore heroes, where you want every edge you can get.