Hello there, sir;
I don't quite uderstand your..should i say ,,question" or ,,your own personal opinion".. But either way, you can leave ,,Mobile Data" allways ,,On" or chose to swich it when needed.
It can be found under cellular->sim settings. Other hand, there is numerous app in store for shorcut to it, even own Windows Phone 8.1 notiffication bar-shortcut.
There is ,,Data sence" so you don't pass your limit.
Hope that solve your question-fact.
Have a nice day!