If you have selected an object such as an artboard or screen (or have selected it by mistake), including many nested text objects - typing “Control-B” BOLDS / UNBOLDS all text in the selected object, including all nested text… While I can see for simple objects this is convenient…
It’s a HUGE PROBLEM if you have a large screen or perhaps an Artboard that has a bunch of screens on it… Its very easy when using the keyboard to accidentally select the artboard by mistake, It is very easy to accidentally type CTRL B while copy / pasting objects (intending to press CTRL-V) or using other keyboard shortcuts… The result is that ALL of your text becomes BOLD!! Your entire text on all of your elements on all screens if you select the parent screen by mistake… If you don’t notice this for say 20 minutes and continue working, it is near impossible to fix...
This is massively broken as it becomes a huge pain in the ass if you discover that all of your text weights are now incorrect throughout all your work...