But I consider it unconscionable that the airline can give me the ultimatum of having my laptop, camera, etc. taken from me to board this flight or pay more to take the next flight.
The items which you list CAN and SHOULD be placed under the seat in front of you. The only exception is large professional type camera equipment. But that is the risk that people run when travelling.
My company mandates that we do not place our laptops in checked luggage under any circumstance, even if that means that we do not travel that day.