To make WordPress 4.2 version a great successful plugin, installation and update section was improved drastically. But some users did not like that so now we are just left with update section. The auto activating plugin after installation was not that good idea, so some bugs that were reported are highlighted here:
1 A notification process for activating the plugin should be there.
- Menus not updated. You need to refresh your page to see changes.
- There are plugins such as maintenance mode ones that user will not want to be activated right away.
To get more information on the topic and its process, have a look at the post, http://wptavern.com/enhanced-plugin-installs-axed-from-wordpress-4-2