ailing to weigh the advantage and disadvantage thoroughly:没考虑解决方法带来的坏处

In claiming that ... the author needs to do more comprehensive research on both positive and negative effects of the proposal. Although the proposal could be adopted to (solve the problem) to a certain degree, however, carrying out the proposal may actually bring about more harmful effects. (possible harmful effects ignored by the author. )

Under such scenario, adopting the author’s proposal would harm, rather than benefit, (the author’s purpose).

Incomplete thought:

Failing to weigh the advantage and disadvantage thoroughly:

False dilemma:两者选一，没考虑其他解决办法

In explaining ... the author is presenting a false dilemma. The author simply assumes that (the situation would be either A or B), while the two...are not necessarily mutually exclusive. (many other solutions/explanations could be more justifiable.) Before ruling out all the possibilities above, the author could not convince us that there are only those two possible explanations for us to accept.