The Harmony Elite can definitely control some things via WiFi, such as my Insteon Lights... I am not sure how it controls my Roku 4, if via WiFi or another connection, but Roku 4 isn't "IR".
The Harmony Elite remote control itself has its' own IR emitter, which is what I use to control my projector in my room. All of my components are in an AV Closet, but my project is still 'in room'. You can point the remote directly at the projector, or 'bounce' it off the screen, which works remarkably well. Normally, when I go in and turn things on and when I turn things off... I'll just point the remote at my projector. However, if I have already taken my seat, and figure out the movie is in a different aspect ratio, I point my remote at the screen & bounce it off the screen & adjust the lens memory via reflection vs pointing at my projector. Similarly, if I am shifting my image a little, or making minor adjustments, I'll just bounce off the screen.
I had an old unused Harmony laying around, so, got the "$100 off" best buy trade-in, so, that made it fairly competitively priced. Honestly though, I don't replace things real often... so, I usually like going with the 'latest & greatest' at the time, so, I didn't spend much time evaluating it vs other Harmony options.