How useful is it to minify CSS and JS if gzip is used?

Question

css

Hello.
Faced with layout under IE (8,9,11).
The code goes in the direction of errors if you minify the script code with various minifiers.
When serving content/js/css/etc. using gzip compression on the server.
I suppose that maybe there is no point in MINIFYING js / css in this case? What do you think?
In advance, thank you all.
UPD: in particular:
css3pie.com/download-latest-2.x
PIE_IE9.js (minified and loaded with error) and PIE_IE9_uncompressed.js (same, but loaded without error)....

Answer 1

Normal CSS without gzip: 50.21kb
gzip: 10.35kb
Minified CSS without gzip: 21.57kb
gzip: 4.28kb

Answer 2

Considering how many graphics are now being sculpted on websites, huge photos on the whole screen and even a few pieces in the slider, the video is looped, there are a bunch of different third-party fonts.
Against this background, CSS minification looks like paranoid nonsense. Well, you won 10-30 kilobytes and so what. Morasm!
Especially when there is gzip.