Margaret Weis and Tracy Hickman are both incredible authors.
I’ve always seen DND druids being the shape-shifting, speak with animals, binding with vines, etc. Fitting the plant and animal shapeshifter esthetic. EHG seems to agree given they have three shifter forms, spriggan companions, and entangling roots.
Shaman, again, doesn’t really have a theme it seems. The skills (Tornado, Earthquake, Avalanche, Storm Totem) scream “natural disasters!” but the passives (both innate and from the tree) are “use Totems!”, but even though we have lots of “convert to totem” nodes in Primalist skills (like Tempest Strike, Upheaval, Warcry, etc). Not a single Shaman skill becomes a Totem. So none of the skills inherently fit the class theme of a Totem user. So we fall back on natural disasters, but aside from Storm Bolts, they don’t have any synergy with each other.
Beastmaster has synergies with all of its companions working together and fighting as one, all buffed by Frenzy Totem. (plus the base Primalist synergies like Fury Leap and Warcry triggering your companion skills)
Druid has synergy with shifting from one form to another, Werebear triggering Entangling Roots, and the Spriggan Form’s Healing Totems working with Swarmblade’s Hives, (plus the base Primalist synergies like Thorn Totem and Maelstrom)
Shaman barely has any synergies between its class skills, they all work with Storm Stacks/Bolts in some way, but their best synergies are all with the base Primalist skills. Off the top of my head, there’s “generate stacks with Avalanche and spend them with Earthquake as Tornadoes cast Storm Bolts passively, using Storm Totem to buff Avalanche and for more passive Storm Bolts”, but I can’t think of anything else to tie the Mastery skills together in a cohesive way. I’m sure there are, but when the best Shaman build for Totems is a Spriggan Form build, you’re a pseudo-Druid, and when the best melee Shaman build is a discount Beastmaster, something is wrong with your class identity.
I don’t believe my class fantasy for Shaman is the best one. But I genuinely believe that all of Shaman’s skills need something to tie them together that’s not Storm Bolts.