Technology is always evolving and advancing. For many years, our answer to providing redundant and reliable storage has been to invest in the hardware. We invested in the hosts, to high-end switching, and on to the very expensive SAN or NAS storage.
These systems all needed to be spec'd out to not only provide for the needs of today, but often were over-spec'd with the next 3-5 years in mind. This meant a lot of dollars were spent on hoping to take advantage of that hardware down the road.
With Hyperconverged infrastructure technology, you buy what you need today and, like lego blocks, add as you grow - no more overspending.
In addition, many solutions now include infrastructure plug-ins to the public cloud which means your investment now allows you to more seamlessly transition from on-prem, private cloud to moving workloads to the public cloud such as AWS, Azure or Google Cloud, thereby future-proofing your investment!