1. This is not a flaw, but rather a whim. I would like, of course, that there was a multiblock here, and not a topgun (the most poppy Ikeev chair Markus for 15has a multiblock), but this is normal, this is the case with all manufacturers. The cheapest multiblock appears in gaming chairs from 35-40k
2. The tilt mechanism + hinges that hold the back do not look very solid, I'm a little afraid in the long run, but everything is identical with any other chairs, with any company or model, everything is done the same way. Only time will tell here
3. The lumbar pillow is too fluffy and elastic, so far I have not had time to check whether it can be reduced. But in general, you can find a comfortable position with it, it’s also normal without it.
4. Backlash in the armrests, but not to say that it somehow offends me, to be honest, just as a fact