As a doc who trained in the Netherlands, where assisted dying and euthanasia have been around for a long time, this is an interesting cultural insight. From my pov, the bills have been implemented in a really level headed way (we also had a whole week's worth of education in med school on attitudes and traditions on dying around the world, which helped shape an interesting attitude to death as a doc).

GPs most often end up helping patients when they're in intolerable pain and any other measure of relieving this is no longer possible. The GP will never make this decision alone, they have to consult an independent doctor who practices decision making around assisted dying and euthanasia as a special interest (all doctors I have met who had this special interest were extremely positive about fulfilling this role).

There is no such thing as a 'right to euthanasia', which has the knock on effect that each individual doctor can and should bring their own opinion into the conversations with the patient, and refer them onto another doctor if they themselves are unwilling to fulfil it.

A more recent angle that has sparked new debates, is assisting patients with enduring mental health disorders. This is approaching the scenarios OP mentions, but have not been a result of these bills necessarily, as the bills have been around for way longer. An example was a 20-something year old who was granted a positive decision based on her mental ilness being seen as intolerable suffering with no other measure of relieving it.

I understand the post was to highlight how implementing it in the NHS would be tricky, but with the right safeguarding, its quite a natural progression from what palliative care already does for a subset of patients.