I'm not at all sure about some of that info
All the stuff about breast cancer risks, for one. All we know is that there is a tiny increase in the number of women on (any) combined HRT (sequential or continuous - the research doesn't distinguish) who get BC. The increase doesn't start until after the age of 51. The increased risk is so tiny it is debatable whether it is even statistically significant and it is far less than the increase from being obese or drinking alcohol. The research used the synthetic progesterones, not body identical.
All that stuff about continuous vs sequential risks is not anything that is in any research I've come across and sounds like opinion rather than fact/research. I mean, both are still using the same amount of progesterone because sequential is using 200mg a night for half the month and continuous is using 100mg a night for the entire month - the overall progesterone intake is the same in both groups.
In terms of bleeding, many peri women are on continuous for one reason or another - I am because I have mild endo and continuous is recommended for endo sufferers. A woman can always try continuous and if it leads to problematic break-through bleeding, then go back to sequential. You're not committed to stay on one or the other. Sequential doesn't always cause a bleed - many women don't get them even when their progesterone stops and that is an indication they are ready to move to continuous.
By the way, women have used the POP for aeons in peri-menopause and it is a progesterone which is taken every day (continuous) and leads to either unpredictable spotting for a few days/a light breakthrough bleed or not bleeding at all - and you can take it until you're 55. But no one gets their pants in a twist about that. I don't get why people are worried about 'unscheduled bleeding' with HRT in younger peri women either (ie 40s) who wouldn't be expected to be post-menopausal yet and whose spotting on a POP would be completely acceptable.