To justify removing, right-sizing or purchasing additional resources, you need to paint a picture for management, or tell a story of what it is your team is currently doing (A); and what it is your team needs to be doing to achieve your goals (B); as well as how to effectively get from A - B.
Your team could probably continue operations without much friction, or need for justification. But there may be under-utilized resources at your disposal, or superfluous ones that could be discarded to cut costs, but changing the status quo often requires detailed and at length motivation, and will be sure to come under strict scrutiny by management unless presented adequately. The problem is, finding the information to put together a detailed account of your story can be time consuming. But not with good data at hand.
Furthermore, if you have had systems in place for a long time without putting them under the microscope - analyzing current and relevant data related to your team’s goals - and haven’t reviewed whether your current systems are still helping to achieve these goals, chances are there is a lot of wasted time and inefficiencies in your processes.
Right-sizing subscriptions could save your firm significant costs but you are unlikely to be granted the go ahead by management to do so however, unless they can be presented with clear indication of this.