Its not always simple though.
We were heavily encouraged to try iui (and if you pursue the nhs pathway you have to, lesbian couples imy area have to self fund 12 regardless if you are good iui candidate)
I know someone who was told that it wouldn't work for her but it was a hoop to jump through and they shrugged when she pointed out she was expected to spend a year and tens of thousands of pounds on a treatment that no one thought would work
For us there was the success rates of iui and the practical cost of it as well as the time cost. Iui for us was quoted as about a 10% success rate, while ivf was closer to 40. We were encouraged to space out iui so it would have easily taken us 8 or so months to do 3.
Or we could go straight to ivf. Which was a similar cost to 3 iui cycles.
Iui Is especially expensive so for us because of using a donor so time cost and financial cost for us meant we skipped it
Its a good example for us of where we felt we were wasting lots of time, we missed one because the clinic appt schedule, the next one our iui was poorly timed because i personally felt they were right on the edge of the window because of a bank holiday, there was no variation when a cycle didnt work or curiosity, we were just expected to keep repeating and throwing money at it while knowing i was aging
Its completely reasonable why you should offer iui but its where we wanted to make our own decision and wanted the power to skip steps at our own financial and health risk
I get that there's an ethical dilema in offering things that maybe only nudge the needle (eg scratches, washing etc) but its frustrating to be told that you cant even try.