I like it this way. I can easily tell which tracks are armed and which aren't. It used to be less obvious, and tracks got erased because I missed disarming a track in a project with many tracks. I welcome this change.
I'm pretty okay with it with the way it looks when Rec armed. I guess before the previous update it was even more bright like a red light when Armed. Which actually looked good kindoff emulating consoles. But even when not armed this button is so obvious on the eyes and looks odd spoiling the elegant design of theme. This post is abt how it looks when unarmed. See how subtile the same button is in Mercury. Here its the first thing that falls in our eyes, it looks odd as its a highly contrasting red kept midst of a total dark theme.
Probably not something some would bother abt. But just like one annoying intrument in a fine mix.
I really want it changed. Great if theme editer will help with that. Will be more happy if its changed in the theme itself, coz I love it when Sonar looks good.