so problem still exist.
This bad scrolling problem also exist on the Google Nexus successor Pixel2 XL.
He tried Opera browser v.49 on this Android 9 device that use a Qualcomm 835 highend SoC.
Thanks Andrey for your feedback.
From time to time i will report if this huge regression is solved or not.
Samsung updated it´s browser to Version 8.0.xxx and switched to chromium 63 engine.
Still smooth finger scrolling behaviour.