The headline tag about sums up my thoughts. These are games that probably should have been part of the line-up already and I never really thought about them not being in the line-up until being announced as part of the line-up.
In the end, though, I pretty much own all the major Nintendo released 3DS titles released prior to 2017 aside from a couple exceptions like Mario Party: Star Rush, Poochy and Yoshi's Woolly World and a couple of the Style Savvy games so the Nintendo Selects line isn't going to have much to offer me unless it throws in something like an Ultimate NES Remix. But like Mop it up, I've got the Wii U NES Remix collection so I don't see the point of getting it for the 3DS much like I haven't bothered getting Mario Maker for the 3DS.
Now if Nintendo Selects included 3rd party games then there might be a lot more that this line could include to interest me as there are plenty of 3rd party games I'm still interested in acquiring at some point.