I'll add that this is not just a "quality of life" feature request. This is an actual BLOCKING ISSUE to a very common type of workflow, especially for electronic producers.
Example: a very common type of processing rack in electronic music (especially for dance-oriented genres) is a "drop rack". In this rack you might have multiple plugins or native devices that are doing all of the following actions at the same time: reducing the track volume, moving high- and low-pass filters inward slightly from the far ends of the spectrum, and pulling the mid-side balance inward toward the mid. You want all of these things slowly occurring across anywhere from 1 to 4 bars of the buildup leading to the Drop section of the song.
You want all of these mapped to "one knob", and you want to create a automation ramp with ONE curve that you can fine-adjust for the right feeling of "wash out" prior to the Drop, so that the Drop hits as hard as possible when the full volume, full spectrum, and full width suddenly snaps back with a sudden vertical automation move after the gradual curve up.
This simple, common automation user goal is child's play in other DAWs, but it's next to impossible to implement in Studio One. It should be a simple matter of assigning four or five plugin parameters to a single macro knob, adjusting their relative XY thresholds and transition curves, and then spending a mere 15 seconds of drawing ONE automation curve for that knob. But instead, we're forced to right-click that single macro knob and assign it to automation, which blows it out into 4-5 different automation lanes, and then we have to laboriously hand-draw the automation curves for each parameter in a way that tries to replicate the relative XY thresholds and transition curves of each parameter.
It's seriously an egregious omission. If you went to the trouble of adding Macro knobs in the first place, it's because you understood how essential this notion of "single knob" control is to modern music production. It's unfathomable why you didn't also add the ability to have a single automation curve simply control the movement of a macro knob.