Alteration of dna or chromatin structure is a form of gene regulation seen more in eukaryotes than bacteria, why is this?

Eukaryotes are more composite in comparison to prokaryotes like bacteria. In eukaryotes, the processes of translation and transcription take place in distinct compartments like translation take place in cytosol and transcription takes place in the nucleus.  

However, in bacteria both the procedures take place in cytosol as the genetic substance of bacteria is found in the mid of the cell, which lacks nuclear membrane.  

In prokaryotes these processes are comparatively simple, however, in eukaryotes, these processes are highly composite and need regulation. In prokaryotes the control takes place only at the level of transcription, while in eukaryotes the regulation of gene takes place at both transcription and posttranslational level.  

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