I'd argue that any tool or system of any kind is for when you are in need of assistance. Whatever gets you up to momentum each day, refreshes context, minimizes malaise, and maximizes just knocking things out one by one.
Let me frame it another way. If you did the couch to 5k over the course of a few months and succeeded, is it the app that got you to running consistently or is it the fact that it kickstarted you into momentum. There is no ideal. There's whatever makes you feel like you did good work on the right things today and that momentum for tomorrow seems like you've got the right tools in place to get there and forgive yourself when you fall off the wagon. Don't worry about specifics other than that whatever you engage in seems to give you momentum at a pace you find appropriate.
Let me frame it another way. If you did the couch to 5k over the course of a few months and succeeded, is it the app that got you to running consistently or is it the fact that it kickstarted you into momentum. There is no ideal. There's whatever makes you feel like you did good work on the right things today and that momentum for tomorrow seems like you've got the right tools in place to get there and forgive yourself when you fall off the wagon. Don't worry about specifics other than that whatever you engage in seems to give you momentum at a pace you find appropriate.