Cleaning up when enabling and / or disabling.

From a drush patch proposal #304783: Add `pm enable` and `pm disable` functionality to Drush these calls are made

// Enable and install the schema of each module.
module_enable($packages); 
drupal_install_modules($packages); 
module_invoke('locale', 'system_update', $packages); 
actions_synchronize();
drupal_clear_css_cache();
drupal_clear_js_cache();
 
drush_print(t('Project installation completed!'));

foreach ($packages as $package) {
  module_invoke_all('drush_pm_post_enable', $package);
}

I'm not sure why all these calls are used. The clearing and synchronize seems logical. But first enable then install?

The patch uses also

$files = module_rebuild_cache(); 

If I go to use this I would loose drush mm dot. Is that bad? I tried to fix this in (bad core patch alert;-) #310898: Making module_enable and module_disable API functions where chx in #10 is about to fix it.

Do we have bugs about this?