What are the main issues/shortcomings of cloud computing?

Many startups today use AWS/Azure/GCP/Rackspace/etc to power their IT, especially when they just got started. When they grow at scale, some of them prefer to get back to owning hardware, or colocation. Others stay there. In your view, what are the main issues that cloud computing has? If you can, be specific about your use case. Thanks!

Cost is the main one, with flexibility of selecting your own hardware being second. If you are just getting started, and you want to keep costs low or you don't have enough demand to justify buying hardware or building data centers, the cloud is perfect. This is the Uhaul stage, where you only move once every few years, so it makes sense to rent.

As you grow you might find that you were starting and stopping servers all the time to match demand or for batch processes, but you keep 100 servers on all the time. Or it could be that you want specific hardware that the cloud providers don't have (e.g. a specific CPU or drive). It might make sense to move these to purchased hardware to keep costs low or get the exact hardware you need, but remember that you'll have to deal with buying new hardware when it gets old or fails, and buying additional hardware to scale. This is the touring band stage, where you buy a van instead of renting one.

We know that the majority of companies want (and need) to use a hybrid infrastructure, private/public cloud. Moving workloads from private to public and viceversa is the main issue, for several reasons. Managing costs at scale, like you said, is a challenge for many companies that want to go back at some point.

How can you make it easy to move workloads from public to private and viceversa? What are the best providers today offering a complete hybrid platform with public cloud and hardware (dedicated servers or similar)?

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