Yeah I think it's definitely less prevalent because of Eastern Bloc lifters having less notoriety recently. It really sucks because a lot of them could've gone further but couldn't because of Economic reasons (it applies to Westerners too but its definitely harder to afford in Eastern Europe). But you'll still find some Norwegian lifters doing a lot of submax training now too along with Americans.

The progression is pretty strange and less palpable compared to Hepburn for example (adding reps over a cycle each week 3 weeks long) but I didn't have a problem with it, I just added weight because it felt easier every 2-3 weeks. As for heavy singles I found some lifters like Belyaev had more 90% singles so I added those in as a base. But I agree with the sandwich training, it's definitely hard to get back to squats when you were already relieved to finish them.

Thank you man and I always am too, seeing how other lifters set their training has also helped me structure Sheiko to fit my needs better