As an open source maintainer, I am reviewing roughly 25 ideas per day - whether they are feature requests, design proposals, or pull requests. Inevitably, this leads to saying "No" quite a bit as well. Usually, this is in a softer for like "No, not right now", "No, not in its current form", or "No, unless someone else approves", but the outcome is the same: the change is not accepted, and the emotional impact on the reviewer and contributor is similar....
Across the ecosystem, a variety of software support policies can be found, where "support" can mean, bug fixes, security patches, and sometimes technical support. However, they can be roughly categorized into two types: Rolling release: only latest release supported. At an extreme, this is the HEAD git commit. LTS (Long Term Support): Support latest N versions. Sometimes specific versions have extended support. "Long" is relative: Kubernetes supports a version for around a year, while RHEL does for 10 years....