Debian, Rust, and librsvg

Firstly, it's a different kind of debate.
Regarding the init system, the options where:
- keep sysvinit
- switch to systemd
- switch to upstart (IIRC)
Regarding librsvg, the options are:
- keep up to date with upstream
- don't keep up to date with upstream
(unless I'm missing something)
Is it a good thing that upstream switched to Rust? Maybe, maybe not, but it's not like Debian has much to say in it: it's upstream's decision.

Secondly, the importance. The choice of init system has its implications for the whole system, for all systems. The choice of librsvg only has impact on systems that use it. Perhaps that is a lot of systems, but demonstrably less. (Case study: at work we made software that runs aboard ships of a client of ours, collecting all kinds of data from sensors and sending that to a number of onshore servers. It runs on Debian, and I checked: no librsvg installed or needed. So no, I don't think librsvg is a core component as you claim).