You've also correctly noted a couple of potential downsides to adding new credit — hard inquiries and lower average account age. (speakingofcredit.com)
For Customers who typically maintain higher balances and want to earn interest based on their monthly average account balance. (wsfsbank.com)
However, while new cards can be beneficial for credit utilization they may adversely affect your credit score through increased inquiries and lower average account longevity. (investopedia.com)