I would assemble Ikea kitchens myself anyway, that was fun. What was annoying, for example, is the baseboard. I set up about 3.5 m L kitchen for a 2000 euro rent-ready granny flat. Handleless with appliances partly from Ikea and partly online. And it is cooked on daily.
I see it the same way.
In the past (always these sayings from the old people...) when building a house, much more was done by hand yourself. Back then I laid my first tiles (crooked), boarded the roof, built walls, painted of course, etc., and made a lot of mistakes.
But at some point you learn something, become bolder and more confident. Our kitchen installer doesn’t like the boring "screwing" work so much and so it fits. By now, assembling Ikea kitchens alone is no problem anymore (except for details), just like laying engineered wood flooring etc.
There is always a first time and something self-built has a different value for me.
But you absolutely have to realistically assess your limits, that’s why I would never tile my bathroom.
But it is quite unfair to compare the price of a self-assembled kitchen with the price of a fully assembled one.
You naturally have to add the real costs for transport, assembly and other circumstances. In case of problems, Ikea may not come to the house but possibly the chosen kitchen installer. You have to assess all that for yourself.
The service at Ikea worked well for us. A thick countertop with aluminum that was mistakenly measured by Ikea was charged to us at zero or replaced. That was easier than I ever expected.
Their non-transparent pricing policy doesn’t even allow me to buy the kitchen without assembly!
I never had this idea but maybe it would be possible after all to just buy the kitchen and do (or have done) the assembly yourself? That would be interesting and the dealer would also be free from some obligations, since he only acts as a seller/intermediary.