Grove, is surely not for hobbyists. It does not include twigs, which you have to buy separately or create yourself. If you create yourself, why not create a whole tree ))). Moreover, beginners may have issue of getting realistic enough. For hobbyists, in-build addon saplings do good job. When I need photorealistic thing, better just to keep some high quality trees (downloaded from various sources) and use a particle system - which is pretty straightforward thing with complete control on where trees are shown, what size, etc.
Yes, grove had been an excellent choice if it had enough of assets, twigs, all in single pack ready to work immediately.
With that all said, it is still a powerful addon, and worth buying for professional need (for professionals requirements differ, moreover, every penny spent is recovered).
In case of trees (for hobbyists), creating with ease is important, as they are not the main actors in most scenes, rather a beautiful props.