Number 3 was not an issue for me. I never felt forced to change though I felt it may happen in the future. I wanted more money and I didn't want any more near misses (I had two that could have killed me but walked away with barely a scratch).
Job quality is a mixed bag I feel. On some jobs it's better IMO - especially when I can get to windows that weren't possible before. On other jobs there are sometimes issues that weren't there with trad - such as milky frames, poor seals, or very occasionally, on seals which have been treated with some stuff that feels a bit sticky to the touch. Upper floor sills can sometimes be an issue as the results are not checkable.
Basically, I just wanted more money without risking my neck - though I did initially underestimate the costs of switching to WFP and am still repaying the loans from the startup costs. Even so, the profit margin is still a lot higher even after allowing for extra costs.
EDITED TO SAY: No way would I voluntarily return to traditional window cleaning. I wouldn't even do it if I could up my prices by 50%. I really do mean that too.