4.  Good/Superior/Wonderful as A is,……, it has its own disadvantages/ brings its own problems, too. For one thing, it……, For another, it……

Conc:
 While taking advantage of……, we must try to find ways to reduce its disadvantage to a minimum so as to let it serve our purposes better and make our life more exciting and attractive.
 Although there are many arguments for and against……, we must realize that……in itself is neither good nor bad. Actually, its value to people and society depends on how it is used.
 In any case, whether the ultimate effect of ……is good or not, one thing is certain that……in itself is neither good nor bad. It is the uses to which it is put that determine its value to society.
 The key point is how to make good use of its positive aspects and avoid its negative points.
Weighing the two sides, both arguments seem to be reasonable, after all.
When the advantages and disadvantages of……are carefully compared, the most striking finding/conclusion is self-evident/ obvious.