What is hidden by the dismissive claim of 'single issue':
Medicalisation of children and young people for gender affirming treatments that have been now shown to lack the evidence of improving the patient's life in the long term.
Loss of single sex spaces from toilets, changing rooms to prisons, shelters, refuges and crisis centres. It also includes loss of single sex provisions such as single sex swimming pools. Also included here is the potential loss of female single sex groups meeting for any reason.
Reduction of safeguarding for children and vulnerable people and female people. Because there is now been a political move to treat one sub group of male people as being able to sleep in accommodation, access changing rooms and toilets that were previously female single sex. This also impacts groups such as Girlguiding as well as schools and any other group where there was an expectation that female people would have their own single sex space.
Education issues regarding gender identity. This also has an overlap removal of female single sex spaces in allowing male people to enter female toilets and changing rooms.
Reduction of opportunities for female people in employment or recognising outstanding female people in a society that continues to negatively discriminate against female people.
Sports - there is a loss of safety, fairness and opportunity for female people in sports with the inclusion of male people in female sports events at every level. This is also having a direct counter effect on encouraging female participation in sport.
Issues arising in health where female people no longer feel confident in asking for and receiving female health carers. There is also an issue with communication about female health issues lacking clarity due to forced language changes. There is now even the issue where NHS trusts are potentially providing the services to male people to feed infants from their nipples without their being even halfway adequate research into the drug interactions within that substance.
Reduction of ability to meet and campaign through cancellation or protests. Very few other groups are prevented from meeting as groups discussing issues arising from prioritising gender identity. We have seen that even when lesbian groups wish to meet, they are not only protested to deter entry into the venue but loud music, horns and shouting is meant to then drown out the voices. Women's rights rallies are regularly protested and require long lines of police to protect women from violent and intimidating protestors. Yet, the same is not true for people wishing to meet to discuss gender identity. These meetings and rallies are not interrupted by others.
I am sure that others will come and add to this list. These were just very quick top of mind while I am being constantly interrupted by family issues.
My point is that this is not 'single issue' it does encompass a whole lot more.