What if we use only main_phase in our test out of all other sub-phases of run_phases in UVM

In reply to chr_sue:

Thanks for reply , i had corrected my question now. I understand that this is bad coding style. but i still have this questions :

What will happen if i use only main_phase of sub-phases available for run_phase (i.e. reset, configure, shutdown ). Will this affect in anyways?