In the 40s perhaps, but like local leves the completion bonus for the low leves is terrible and that's where the bulk of your SP comes from in a leve.
Always. Which is why I can't stand the new solo based leve system. It's fine having some solo content like that but they didn't really replace it with anything yet. They did say there would be a dry period for a couple of patches after 1.18 before other levelling methods are implemented. I'll wait until then to rank up LNC and MRD to 50. If you look hard enough you'll find the post and see what cool group based levelling is coming. Grinding is not fun.