- The big one is that, at least what I see from my admittedly flawed perspective, there appears to be an active annoyance by a significant number of participants on the various issues on the importance of maintaining library ergonomics under constrained execution environments, with bare metal / free-standing environments being an obvious scenario. An example that comes to mind being stuff dealing with situations where 'global allocation' is actively harmful, which, in addition to happening in kernel development, also happens when building managed runtimes.
- What comes across as an almost begrudging foreign-function interface, no ABI commitments, and lack of clarity about what is undefined behaviour under the `unsafe` operation needed to engage in any of this
- Cargo VS rustc and integration into other build systems. Sanctioned VS unsanctioned paths more generally.
- Prominent people in the community making comments about actively suppressing individual stylistic preferences because it's better for the collective