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Why Spring Boot 2 specifically? AFAIK community support for it has ended and you should be moving to SB3 if possible

Good question! Though, SB2 is supported until Nov. '23 (see https://spring.io/blog/2022/05/24/preparing-for-spring-boot-...). We definitely plan to be upgraded by then.

The eternal update game does not always reward you.

F.ex. Maven and Gradle and not necessarily better than Ant.

Older things are often stabler unless they are over-engineered.

Spring Boot is however completely meaningless in the first place.