That's because the picture above is from Malmö. It is true that Sweden is more conservative in its painting schemes, you call it probably more tasteful. But I think it shows that it is a gradient.

I never experienced that "Soviet trauma" yet rather disagree on your analysis of Petrzalka. This patchwork colour style isn't a function of soviet trauma, it is rather what those large commie block districts with long and tall buildings need it in order to break up the scale into something more humane. Both, horizontally and vertically. Modern blocks are not built like that, they are also generally not coloured like that. Different building typologies work better with different colouring schemes. And no, Panelaki are no failures, those are often pretty popular places to live actually, when properly maintained, also on the inside.

There are of course differences in styles in Sweden vs Slovakia among contemporary buildings. Sweden has some of the better modern architecture in Europe. Vienna for example, which is just across form Bratislava, has a lot of the worst looking (even though it has been massively shaped by Swedish urban planning). Bratislava is actually no worse than Vienna probably better looking (even if probably worse building qualityas such). Things are not as clear cut. These detached blocks here in Lund: https://www.google.com/maps/place/Malm%C3%B6,+Schweden/@55.7167554,13.2314728,123a,35y,57.74h,60.1t/data=!3m1!1e3!4m6!3m5!1s0x465305a574c491ff:0xd3a905dfbd4888e5!8m2!3d55.604981!4d13.003822!16s%2Fm%2F011l894y?entry=ttu&g_ep=EgoyMDI2MDQwMS4wIKXMDSoASAFQAw%3D%3D

I find that style ... servicable. It could be just as easily be in Bratislava or Vienna, or somewhere in Germany for that matter. In the same colour scheme too.

PS: examples of Luzhkov's style and capitalist romanticism from Russia are pretty terrible, they don't exist in Slovakia to my knowledge, Moscow is further away from Bratislava than Stockholm if I am not mistaken. Not just geographically.