My son and DiL have a conservatory. Cannot say they really need the extra space as just the two of them in detached 4-bed house ( two en-suite). However, a couple of years after they moved there they had the roof re-done with those special resin tiles, giving it a normal looking flat ceiling,.
It has proven very useful over the past couple of years as both now work, almost entirely, from their home. One bedroom upstairs has always been fitted out as an office/library, so DiL uses that, and son then fitted part of that conservatory into an office for himself.
Both have their breakfast together, then go to their offices for their days work, meeting up again in the evening. Took their cat sometime to come to terms with someone being around all day, every day.