Our team has seen 2 breaking changes in the past month from RH that caused problems in production. One in RHEL7 and one in RHEL8. It's definitely making us question the wisdom of the RHEL LTS approach. The LTS part is not what we're seeing.
Same, RHEL says you should be compatible against all minor versions and it doesn't matter if it's 8.5 or 8.6. Upgrades can happen without you noticing, but our software would only run on specific minor versions without investing time and development energy. Several installs I've worked on required an OS rebuild because the version crept into an unsupported minor version.