Therapy is actually a wonderful adjunct to medication because it helps instill lasting behavioral changes. A lot of people mistake the early motivational boost of stimulants for ADHD remission, but once the energizing effect of stimulants disappears due to tolerance, they’re left with the same bad habits they started with. Therapy can help build a better foundation for when the energizing side effect of stimulants disappears and only the attention-enhancing effects remain.
Therapy is a lot more work for the patient - more time consuming, more costly, can be emotionally taxing in the early stages, etc. So I understand the desire for a meds only solution, and in some cases that is possible. But talking about therapy more generally I would encourage anyone who can to give it a try, just as I would encourage people to put effort into their diet, exercise, etc.
Obviously make sure it is evidence-based therapy though, something like CBT that has been well-studied. There are flavors of talk therapy that are total pseudoscience.
A lot of doctors start patients at crazy high doses (over 10mg) and a lot of patients do indeed benefit from 50+mg.
If medication isn't tolerated, starting therapy early seems like a great idea.