It's true that consolidating manufacturers might incur initial costs when transitioning to a singular solution. However, many manufacturers take this into consideration, potentially offering better pricing or providing funds to facilitate your deployment and adoption.
It’s important to remember that optimization may not actually be the key to cutting costs. Sometimes, the benefits can be quantified in other ways. It may even mean spending more in one area to reduce costs in another, like moving from on-premises solutions to the cloud to reduce hardware and data center costs.
Cost optimization is often more of a due diligence exercise that proves you are getting the best deal possible, addressing any risks of overspending and proactively working with a partner and/or vendor to reach the best deal for your organization.