One can never please everyone.
When adding plain Spring samples people will start asking question why DataSources don’t work or their activemq setup doesn’t work (people usually don’t takes days to figure it out, if it doesn’t work < 5m a guide/project/sample is crap even if the error is their own).
The same for XML and JavaConfig for years the argument was that Spring == XML Hell (just take a look at their samples was often overheard/-read) now that is Java based config (a road that even Java EE is taking) it isn’t ok either.
The Spring Boot guides allow you to focus on the core content at hand, instead of all the necessities/complexities around them. Nonetheless I do agree that some basic plain Spring Framework guides should exist. You might wan to comment on this issue