Yes, but why does the Scottish Labour lead feel the need to take this position? Is he trying to distract from other things too or is he truly captured and so blind to the political downsides?
Anas Sarwar is one of my MSPs; I suspect that the current tangle suits him fine. Labour are the third party (out of five) at Holyrood, out of Government since 2007 and replaced as the official Opposition by the Cons in 2016. They need to win seats from Cons (portrayed by Sarwar as playing culture war games re the GRR) and SNP (portrayed as wasting taxpayer money and as hurting individual trans people and fostering an atmosphere of uncertainty/fear by dragging out the Section 35 as a constitutional issue rather than compromising with the UK to amend GRR and get a modified version into law ASAP).
He possibly DOES believe that his position is ethical - he's from a privileged background (his dad was a Labour MP) and anyone he cares about will be well insulated from the worst effects of misogynistic legislation. Most of all, though, he'll do what UK Labour tells him to do and swear publicly (whatever private doubts he may have) that whatever course the UK Lab leader sets is right.
I used to support PR - not now when you get characters like Maggie Chapman in power! Labour benefit a lot from PR (the regional list system) as well. Of their current 22 MSPs, only two were elected by their constituencies. Sarwar is not one of them; his would-be constituency voted for Nicola Sturgeon. ScotLab is also very guilty of recycling the same unqualified and unappealing candidates in some areas - so you vote against someone for the local council, then against them as an MP candidate, then against them as a constituency candidate for Holyrood ... and you STILL get them as an MSP when they get in on the regional list.
PR is still viable and I'd say necessary, but I'd like to see an STV system similar to Stormont's, where each constituency contains multiple seats and they're filled via a ranked preference system. That could get rid of the corruptible and manipulable list system and still allow constituents a much higher chance of having representation not just from the party they wanted but from the specific candidate they preferred.