This is the influence of Bahasa Indonesia. In English 'become' is always used to describe a change, rather than a constant:
In each of these three cases, a change is implied:
These are all familiar, recurring situations, and so we use present simple tense to describe them.
If we say "Full-day school becomes an important issue," a change is indeed implied (from non full-day school to full-day school), but since this is a unique, rather than a recurring situation, then we need a time frame.
If the change happened in the past, but we're not sure exactly when, then we use present perfect tense:
If the change is happening right now - continuously - then we can use present continuous tense:
However, if we are analysing a situation that is true now, constant and without change, as though we are looking at it under a microscope, then we use present simple tense: