allow widgets and widget containers to have a class or id
Suggestions
No - you do not need to setup CSS like that based on specific IDS. Each widget has a set of special widget classes that make it easy to target JUST the widget title - i.e.
.sb-widget-title h2 {
font-weigh: bold;
}If course if you need to target a SPECIFIC widget, then use the ID like you have shown, but I would not recommend doing that. Being uniform in how you display elements on a page is an important part of UI design.
updated by @brian: 12/03/16 03:19:31PM