So if I have a 2017 MBP, with 16gb (not that I need that - I’m a light user), and really love the form factor of Air, but love the MBP display... would you recommend me to NOT swap for an Air?
I agree with you, I much prefer the MBA form factor over even the current 13" MBP, which has the same footprint and only weighs 4oz more.
Regarding the display: You've probably seen the retina MacBook Airs from 2018 or 2019. If you haven't, you should know that they are VERY good. Not as color-rich as the MBP (I have a 2016 MBP from work sitting next to my 2018 & 2020 MBA's), and not as bright (500nits for MBP vs. 400 for MBA). But IMHO, still very, very good, and plenty bright enough for my needs, even in bright daylight.
If you love the Touch Bar, that would be a reason to stick with the MBP line. If you don't, consider the MBA--it's the only MacBook in the current lineup that doesn't have the Touch Bar.
Since you're a light user, you can probably live without the extra processing power of the MBP. I'm a light user in the sense that I rarely edit video and I'm more likely to edit photos on my iPad Pro. I do mostly MS Word and browsing. But I often work with large spreadsheets and data analysis software with large datasets. I have never found my 2018 underpowered, except that burning CDs takes about 2x as long as burning CDs with the MBP.
If your credit card limit will allow, you might order one and put it through its paces at home for 14 days, then return it if it's not for you.