Yes, You’re right, IR is limited with the line of sight. But this is valid for all systems, using IR as a carrier medium. And just because of that there is a interest to have Homey also IR-capable.
Let’s go personal 
I have Homey and i also have a Harmony hub from Logitech. Working quite well together (Homey is “The Boss”)… BUT, i have Harmony in my TV room, Homey is located in workroom. They (rooms) do not “IR” each other. In workroom i have two blandishments:
- To automate a old Kenwood VRS-N8100 (as this is connected as Room-2 to TV-rooms receiver, then just cards to switch on/off and set input are required
- To use a old/cheap IR control to start some flows
So, the point 1 - yeah, may-be another Harmony, which one may be more expensive than the old Kenwood… or just to teach to Homey ~4 commands to send (yes, they sitting together, around 30cm away)
Point 2 - also solvable with “Z-bee” switches/controllers, costing… for 21 buttons ~100…200€ instead of already have IR remote.
