For payload why we don't use associative array?

SystemVerilog
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In system-verilog to store payload generally we use Dynamic array.
Why we are not using associative array in-place of dynamic array to store payload?

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In reply to Sagar Shah:
A “payload” is usually a contiguous set of variously sized data. That fits well with SystemVerilog’s dynamic array type. An associative array is used to model set of data, each with a unique key. People use associative to model sparsely populated memories because only the locations that are used get allocated. You could use an associative array to model a contiguous array, but there would be a lot of extra overhead.

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In reply to dave_59:

Thanks Dave :)