Text rendering differences

Rohit YadavAs already explained, this is a design issue and Microsoft can't really do much about it. The reason why you see differences in rendering between Edge and Chromium-based Edge is due to the layout engine being used (EdgeHTML vs Blink). Although I do agree that in Chromium and its derivatives, the text feels a little thinner and less sharp, but the difference is subtle and it is generally readable (The preferences may vary with user without doubt).

Any major change in the codebase of the layout engine being used in the Chromium project, aka "Blink", could potentially cause major regressions, since it is a mature project and I don't think Microsoft Edge team can now afford to tweak it to make it look like how it appears on the classic Edge. They have better things to focus on at the moment.

Also, don't forget that Chromium is a very complex project and there are many commits pushed to their repository every day, which Microsoft Edge team has to pull. So, any minor change in the core project could break the whole browser's rendering capabilities.

Rohit Yadav  "The rendering difference seems different across most of the sites. If you open and compare them across the old Edge and new Chromium based Edge, there is difference in Text rendering..."

Absolutely.  There is a subtle, but marked difference between Edge Chromium (Blink), Edge Classic (EdgeHTML) and Firefox (WebRender) text rendering, as this screenshot shows:

The Chromium rendering engine is less sharp and less clear in Edge Chromium than in either EdgeHTML or Firefox.   I can't do a direct comparison with Google Chrome, because I don't use it.

A number of threads have discussed this issue.  Quite a number of posters have asked the Edge Team to mitigate the issue to the extent possible, given the differences in rendering engines.  I don't know what Microsoft can do with the problem, given the limitations/issues with Chromium's text rendering.