Tastes are obviously subjective, but for what it's worth it's not like 7-11 does not sell a subset of the same dagashi mentioned in the article.

I did like the low-carb versions of things like chocolate cake they rolled out and in general they have a wonderful line of sweets: https://www-sej-co-jp.translate.goog/products/a/7premium/cat...

Lawson and FamilyMart have great sweets too.

Japanese convenience stores, to me, are fascinating. I could write a whole long form piece just on convenience stores if that sounds interesting to anyone.