I think coastal areas are more marginal than inland. It has always been the case but now with AGW - more so.
It's an interesting point, and down here it's different from anywhere else in the UK. The reason being our close proximity to the European mainland, which can give proper deep, non-mixed out, non-marginal cold. It still can, and still can for at least a couple of decades yet.
The trouble is to access that cold, we need a robust easterly, preferably one that self-reinforces (the classic Scandinavia -> Greenland -> Scandinavia setup). The last time we had anything close to that was the Beast in 2018, before that it was 2005 (which Philip Eden said at the time would be the last proper easterly. 19 years on and we've not had one since, just that truncated one of 2018 and an even more truncated one at the beginning of the recent cold spell).
In other words, the climate we knew down here, the one which brought us continental air every few years and with it, powder, icicles, ice days etc has gone - whether it'll ever come back, I don't know, but it's been 19 years now. Without it, it becomes much, much more marginal, even without the 1.5C of daytime warming over the past 30 years. Now marginal can be great if you're on the right side (as it means more moisture, more snow, albeit the sopping wet stuff more often than not) but as can be seen from the others down here, more often than not we're on the wrong side of marginal.
It'd be interesting to hear from you folks up north: are there local snow-bearing weather patterns that have become rarer of late? That northerly, for example, seemed pretty unusual to me - but as I'm not really a fan of them, I've not paid as much attention as I have to the lack of Scandinavian highs.
And if I were younger, and looking to do a masters, I'd be doing it on the lack of Scandinavian Highs in a globally warmed world. I'm convinced there's some sort of feedback loop going on in our warming world, one which makes it disproportionately harder to attain the right synoptics to bring us a Scandinavian block. Whether that warming eventually tips things back, synoptically, remains to be seen...