I agree the messing around with numbering just gets confusing. Fantastic Four grew to have some of the worst numbering. Launched in 1961 & running to #416. Before being relaunched in 1996 with #1 & again in 1998 with another #1 continuing to #70 until returning to legacy numbering with #500. After #588 the series was relaunched as FF in 2011, before returning to legacy numbering again with #600. After #611 it was relaunched again in 2013 with #1 & again the following year with another #1, before returning to legacy numbering a final time with #642-645 before being cancelled. Just one reason readers probably dropped off.