Both comes from OG explanation. But I can't understand when the pronoun is allowed.
An executive who is heavily committed to a course of action is likely to miss or misinterpret signs of incipient trouble when they do appear, especially if it has worked well in the past (x)
OG : unclear because many nouns intervene btw referent and "it"
Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become precisely the opposite, a tool ~ (0)
OG : "it" clearly refers to " the radio"
An executive who is heavily committed to a course of action is likely to miss or misinterpret signs of incipient trouble when they do appear, especially if it has worked well in the past (x)
OG : unclear because many nouns intervene btw referent and "it"
Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become precisely the opposite, a tool ~ (0)
OG : "it" clearly refers to " the radio"
