For running workouts (and outdoor bike workouts at least), I am not always well positioned to start my interval at a precise time. Sometimes to get in a good spot (terrain, traffic) I have to extend my warmup; sometimes the recovery takes longer (for example, it takes me longer than 30" to jog easy down the short hill I just sprinted up for 30").
In the past, when I’ve manually entered written workouts into garmin connect. I generally take use lap press for this reason, and I’ve found it quite helpful.
Please consider implementing a “lap press” to start the intervals for workouts that sync to garmin connect. For any warmup, recovery interval, or maybe even a big step up in effort, it would be great to have a lap press to start the effort. Especially for shorter intervals.