Good point, and that's why, six months back, I chose to buy an iMac 5k instead of a laptop. I saved a couple of thousand dollars, got four USB ports instead of two, and a gorgeous 27-inch 5k monitor that I couldn't buy separately [1].
In my case, mobility wasn't a requirement, so a desktop was fine.
If mobility is a requirement for you, maybe you could buy an iPad Pro or a cheaper laptop than you otherwise would buy, like the single-port Macbook.
[1] It wasn't available in India, and even if it was, it wasn't compatible with most Macbooks. The single model it was compatible with, it required two cables to be plugged in. And the monitor would have been out-of-date quickly, since it didn't support Thunderbolt 3.
In my case, mobility wasn't a requirement, so a desktop was fine.
If mobility is a requirement for you, maybe you could buy an iPad Pro or a cheaper laptop than you otherwise would buy, like the single-port Macbook.
[1] It wasn't available in India, and even if it was, it wasn't compatible with most Macbooks. The single model it was compatible with, it required two cables to be plugged in. And the monitor would have been out-of-date quickly, since it didn't support Thunderbolt 3.