Appreciate the comment. Personally as long as the butter is cold and you don't handle too much especially after adding the raspberries (which can become more liquid), I haven't tended to find them sticky, but know the juices can make them more so. And yes, they do expand a bit and more bite-sized can be good.

To a point, yes, but they can be a little tricky - when you defrost frozen berries they usually become pretty soft and have excess liquid, so I would suggest you defrost, drain them before adding and take care not as you mix them in that they don't break too much more. You could avoid them breaking by adding frozen, but then they'd make the dough wet as they defrost when they cook, so I think adding them defrosted is probably better, on balance.

Indeed - they're pretty packed with fruit and so you get lots of their yummy flavor. Glad you enjoyed.

Hope you enjoy, they're definitely worth a try!