At least around here, (as in all of Ohio, talking to other arborists) we need more people who know what they are doing planting trees. They almost always come too deep from the nursery and almost all of the 'landscapers' plant them even deeper. It takes a little more time per tree, but find that root flare before setting final grade!
Tree planting does kinda "push it's way" into busy seasons but we've found a price point where it makes sense to keep doing it. Other companies have started referring planting to us as well. Some long days, but feel good about walking away from the site when done!
I tell a lot of people I'm not a designer, but have ended up doing a lot of planting designs that I think are pretty nice... usually with a number of discussions with the owner about what they want. A truly trained designer would do better with the visuals...but they tend to have poor selection and WAY too many plants. In an ideal world I'd like to have some back and forth with a designer about matching plants to the site and thinking about growth for the next 5-10...or 50 years. Haven't found that person yet. A designer might not need general liability insurance