The Body is nothing more then a container for a PartDesign object, nothing more. There are several construction objects, where a multiple solid Body is much more better to handle against a single one, even when the result is in the end a single solid Body.
Examples:
Francis Runner, here you construct the runner base and runner crown single. Alsu you construct the runner blade single and pattern it before the boolean operation, because as all operation before the boolean operation are much better to handle. At the moment i must clone every single blade and position it per expression, which is not a good workflow (and not parametric, since i can not change the number of blades quickly, but not neccasyry in that case).
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Just said, that i can sot show the runner base and runner crown here, since the boolen here make an error.
Everything with spokes, it is often better to handle such cases, when you split the construction in outer object, inner object and spokes, which is a mutilbe solid.
Here,
viewtopic.php?t=76711, a crane, i would construct the reinforcement in a Body in a pattern way, which is then not a single solid. Then trim the contour and at least union it with the pillars.
Generally everything with ribs, like a reinforcement for plastic injection molding. Here you also make at first a pattern and trim the contour. Then it is often the case, that is is a multiple solid. After union with the Body, the result is a singe Body, but not while working on it.
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Here as workaround made with Part, but that is bad practice, but still the only good way atm.
Here,
viewtopic.php?t=70748&start=10#p665456, everything which is complicated to cut. It is a very common that you make a tool (in that case a Body) for a cut. Here this person make a workaround to make a singe solid, that it works. But i am 100% sure, that if this not a singe solid, but a "just patterned" single solid Body, it is much easier to handle (and the performance issue a better, since OCCT have problems with the helix - bottom connection).
If someone pattern bolts and await, that any (future or workbench) BoM generation works, it is its own fault. Also the Part Container is no replacement, since it breaks the PartDesign workflow, also it has a complete other usecase.
Greetings
user1234