The person you're replying to is definitely overly flippant, but you've taken a sort of Gish gallop approach where you think if you list enough individual things that have to be done, that'll be overwhelming evidence that it's impossibly difficult. But the things you've listed aren't as hard as you want them to be on reasonable small business scales.
We are a company with 4 IT employees including myself, and two of us alone (both full-time programmers) handled our hybrid cloud migration. We rented a rack in a colocation facility. I learned how to design racks in a couple days and did the rack design myself. We bought servers from Dell and network equipment from Meraki. The colo facility found us an inexpensive contractor who racked and stacked everything to my design, and remote hands does any ongoing hardware maintenance. The other guy had an old, outdated CCNA and he designed the network. We got a fiber connection to AWS up and running for a hybrid cloud approach. All of this was very doable for a part-time two-man team with other job responsibilities and we're saving a ton of money for database and workstation hosting--big, expensive, totally static workloads. Perfect for on-prem. The ongoing savings vs. pure AWS exceeds my own salary.
It was clear from the outset that we could accomplish this. I wouldn't have signed us up for a boondoggle. Certainly, there are more demanding configurations where the complexity would be too high, but people act like on-prem is literally impossible without a team of dedicated staff in every case. It's not. It can be doable.
