Why does some integrated not come with tone control?

[dheran]

Looking and Stormy Normans Plinius amp, made me ask this question

Why no tone control on some integrated?

 

[ScottulusMaximus]

 

[dheran]

 

[wanda]

 

[Katji]

 

[Rodney_gold]

 

[dheran]

 

[ScottulusMaximus]

 

[dheran]

 

[thenoizeguy]

 

[chrisc]

 

[Rodney_gold]

 

[dheran]

 

[croak]

 

[Ampdog]

 

[blizzard]

 

[Stormy Norman]

 

[Steerpike]

 

[Ampdog]

 

[santoshlv426]