Just speculation here, but there are several situations where a slide may be desirable. Construction sites vary widely. Available equipment varies widely.
1) It is very possible the road to delivery site is above the construction site with no access from below.
2) It is also possible there is a road both above and below. I would much rather slide bricks down the hill, that carry them UP.
You bet! Have you ever priced a gravity switch and dealt with lead time?
Sincerely,
Toolmaker51
...we'll learn more by wandering than searching...
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