If you are talking about just skill choice, then yes the classes are very similar 1-10, and they have to be as they all need Builder, Consumer, and CC for their first 3 skills. It is also a conscious choice to limit the skills early on so you can learn telegraphs, CC for moments of opportunity (MOOs), and the basics of your class resources/innate. The challenge of the game is more focused on positioning, aiming and timing. However, even with 3 skills, the classes play differently if they want to maximize their output. For example, a stalker is going to approach combat differently than a spellslinger. Take the common situation of a mob casting a standard cast time telegraph, the stalker will want to dodge through the mob and use Impale from behind (backstab) and then try to interrupt at the last second to get a MOO and also allow another backstab that will do increased damage. A spell slinger to maximize is going to just dps the mob until the last second and then gate through the mob, turn around and do burst damage (e.g. use spell surge) durring the MOO. So even with just 3 skills those classes work differently. As you have seen watching the streams to 25, the telegraphs progress in difficulty with their speed, shape, variability (both speed and shape), channels, disjointed telegraphs, and telegraphs being proceeded by CC of some sort. Each class will need to deal with these differently because of different durability, skills and survival techniques.