To put it more strongly, why should users have to use 3rd party (and pay extra) just to get basic EQ and Comp functionality of similar quality to all other DAWs? Mclass hasn't been updated for...how many years now?
I have trialed most of the RE EQ's and I own a couple back from when VST's were not a thing in Reason. I never use them any more because in terms of GUI, features and even CPU usage (!), they all kinda suck* compared to other DAWs and VSTs. A general purpose EQ these days has the features of GEQ-7 as standard (and without the ugly old fashioned GUI).
Serious tip: If you are going to pay for a 3rd party EQ, just get a good VST - something like Fabfilter Pro-Q - it outperforms all the RE's by far and will save you money in the long run. If you really want to get a "vintage" type, there are a couple of excellent free Pultec-style VST's.
*Selig's coloring EQ is an exception as regards features, tuneability and saturation, but that's more of a special case, and again it costs a lot of money.