If we built a JWST today how much better would it be?

Good idea to explain when using abbreviations, as you may receive more answers then.
Didn’t know what JWST meant so had to look it up.

James Webb Space Telescope – Wikipediahttps://en.wikipedia.org › wiki › James_Webb_Space_T…
The James Webb Space Telescope (JWST) is a space telescope designed primarily to conduct infrared astronomy. As the largest optical telescope in space, .

As for your question.
Since technology is advancing more rapidly I woud expect newer devices in the present and the future.

I’m far from an expert, but I have been following some of the details of the JWST and it’s mind-boggling how advanced it is. I suspect if they wanted to build a 2.0 version, it would be necessary to learn from the 1.0’s shortcomings over the coming years moreso than advancements in CPU performance or something. Micro meteors may be a bigger problem than anticipated for example.

Perhaps not much better due to the law of diminishing returns. Hubble was amazing the JWST less so, at least up to now.

Yes. There’s already a number of telescope concepts in place that would be many times more powerful than the JWST.

This is one of then: https://en.wikipedia.org/wiki/Large_Ultraviolet_Optical_Infrared_Surveyor

I would like self healing windows and mirrors. To protect from micrometeoroids.

Sorry that I couldn’t find a link, its mostly emotional healing stuff on the Goggle.

The next step would be something 10x bigger and assembled in space.