In general using flex is much easier for developer if you want to create form or dashboard and I will ise it too.
But in general it use more CPU usage compare to XY con…
When I create P&ID diagram with embedded view as symbol I saw flex box is slow loading compared to xy.
So for q1 no I use flex too
3 when import SVG into perspective there are a lot of property of it, I simply add my own property or edit those. One of the most important is style