If you are making a SPA, you have no assurance that they are in sync though, even in this instantaneous situation. By the time you load that array someone could have edited that data in the backend already. This is important to keep in mind so you don't make any assumptions that later become very real bugs. So if you have an application where there aren't a ton of live edits, this may not matter as much, and you're right about that. But backend/frontend are never really in sync and making this assumption might lead to weird UI/UX behavior down the line, as your app grows and you get more users editing the same data.
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If you are making a SPA, you have no assurance that they are in sync though, even in this instantaneous situation. By the time you load that array someone could have edited that data in the backend already. This is important to keep in mind so you don't make any assumptions that later become very real bugs. So if you have an application where there aren't a ton of live edits, this may not matter as much, and you're right about that. But backend/frontend are never really in sync and making this assumption might lead to weird UI/UX behavior down the line, as your app grows and you get more users editing the same data.