Every time a web designer complains that a full-page refresh is "jarring", a bit of me dies. This is like saying a lightbulb turning on quickly is jarring. It's the expected, immediate behavior. If every lightbulb I used turned on with different durations and easing functions or flashed colors at me, or loaded a flashing placeholder while the lightbulb loaded, that would be jarring.
We have had dimmable bulbs that are far less jarring for a long time and now smart bulbs can do the easing automatically when you flip the switch, and change color and brightness depending on time and environment.
It’s such a nice improvement. I don’t even notice until I turn it off and I realize that white light at night is piercing and yellow light during the day makes me sleepy. Or that 100% brightness in the morning and night is way too much.
I think it’s a case of not wanting to go back once you realize what you’ve been missing.
Sure the world you describe with flashing bulbs would be horrible but that’s not what it’s really like.