There were no separate shade structures in EPCOT. Shade was provided by architecture which was at once functional, groundbreaking, and gorgeous.
By contrast, providing shelter by a canopy on a temporary concert stage is utterly clueless design. Clownesque.
It is like renovating the Louvre, using up all space inside for amenities, only to then have to house much of the art exhibition outside beneath a rock festival stage that prevents any view of the building, only to throw one's hands up in despair when criticised: 'don't these critics understand that outside one needs to keep guests and paintings sheltered?'
There is a whopper of a fundamentally erroneous reasoning in there that I hope is apparant.
For Epcot Center, this was a conscious design decision to provide shelter within the pavilions, as opposed to exterior queues. Epcot Center's design aesthetic was to provide wide-open clean vistas, with architecturally inviting buildings that drew the guest in to explore within Future World. On World Showcase's side, the pavilions are built to give the guest spaces to explore, usually around a central plaza (including an indoor "outdoor" plaza, as in Mexico).
Epcot was not designed to have guests standing in lines all day, it was a place of exploration. The exception to this was Spaceship Earth, which, as the central weenie, was expected to be hit hard in the morning as the one attraction everyone would go to first thing through the gate. SSE was also specifically designed as an Omnimover that could devour guests in the hope the exterior queue would not be needed much. Every other original Future World attraction had indoor queues and/or preshows, which act as indoor queues to suck people through in huge chunks. Or they invited guests into the building like in The Land and WoM. All of Epcot's rides were designed to do large (at the time) numbers, hence the lack of overflow queues at opening.
The exterior landscape of Epcot was to be an open park-like atmosphere, that was enjoyable to stroll through, evoking the feel of a future cityscape free of advertising, above ground utilities, etc. Design intent gets lost over time, and people come in with their own ideas and aren't informed on why something was designed a specific way, or sometimes, something just doesn't work as intended. Unfortunately, once changed, design intent is rarely fixed.
Side note, it is nice to see the circular icon back. Hopefully we'll see more of this.