Can the value of Cadence/Temporal shards be changed later?

We’re trying to setup Cadence in production with Cassandra as the data source. Now since this is a new component in our infra and people aren’t aware of it much, therefore we’ll be onboarding only 1 use case for now and use it as a showcase the features of Cadence / Temporal. We’re hoping that many more services can benefit using it.
Now from what I understand, we need to define Cadence/Temporal shards for our max scale, .
This is a little challenging for us in this situation.
Now I want to understand, if the Cadence/Temporal shards be changed later and if not what is the reason behind it!

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Duplicate of Understanding Cadence internals