I think the idea is that if people don't want to divorce if one of them transitions they don't have to, I don't think it forces them to stay together.
This may help explain: some key info from Tinsel's article
If a married transitioner wants to obtain a Gender Recognition Certificate he (and it usually is he), is first given an interim certificate which can only be converted to a full Gender Recognition Certificate once either the wife confirms she consents to the marriage continuing, or the marriage is annulled / dissolved.
So this is a point of procedure where the wife is asked to confirm if she consents to stay in the marriage or wishes to leave it.
To remove this clause removes this point of procedure. As Tinsel goes on to say:
In Scotland, a trans widow’s right to exit the marriage before the status of the marriage changes has been replaced by a right to be notified by the Sheriff that a GRC is being granted.
In other words a wife is notified that her partner is unilaterally and fundamentally changing the terms of their marriage and her legal sexuality, and she has only the right to be notified that this has been done to her.
How is this defensible? And how could any trusting or healthy relationship possibly continue based on one partner treating the other in this way?
Further info relevant to the thread from the article:
An interim GRC holder can do anything they want, wear what they want, call themselves whatever they like, their transition is not prevented. They can change the sex marker on their passport and driving licence. The only thing that they cannot change without a full GRC is their birth certificate.
So this process of recognising another person is in the relationship and has a say of what they wish to do, has little impact on the transitioning partner's transition or freedoms.