Hi. SP PB page has its own not bad SEO settings. And by the way, if you use menu item to publish SP PB page (that is the only proper publication method) there should be no problems with third-party SEO components.
I'm not sure about SH404, maybe there is some strange functionality that does not allow working with SP PB. In any case, when using RSSEO, there are no problems.
The same about Joomla articles with SP PB integration. In my practice, I never encountered SEO problems in SP PB.
Yes, I know that people complain about poor SEO in SP PB. But when I look under the hood, I see that the pages are not published through the menu item, and technical links are used, which are hidden by default from indexing in Joomla's robots.txt .