Well not to play devil's advocate, but EA/Maxis had a Color Wheel and Re-colorable Patterns in TS3, so it's not like this is a new concept for them on those features.
I'm super happy those abilities are being brought back!
Also, Paralives has "push/pull" options to resize things, I'm not sure that's what EA/Maxis is going for (unless I didn't see that part). What I saw was them choosing the size of the mattress then a headboard and footboard to fit that mattress size .... not pushing/pulling it to resize it. It will probably work similar to how TS4 counters work where there's many object meshes you can choose from within one object.
And I personally prefer the way EA/Maxis is doing it, because with the way Paralives is going to do it, the texture will be squished or stretched when resizing. With how they are planning on doing in this next version of Sims, the textures will all be uniform depending on what size mattress you choose. No distorted textures that way.
So to me personally I don't feel like they're "copying" Paralives because some of these things were already implemented in a similar type fashion in various Sims Games.
Now, what I do think is it's possible that they have taken feedback on what the Paralives Fans have ooooh'd and ahhhh'd over for that game and made sure that they also offer similar capabilities in the next Sims game.