It's like asking if the ford model t is a good commuter car. It will work and will get you from a to b bit why would you want to when you could use any car from the last 15 years that's so much more refined.
Wfp can be quite cheap and is far more refined than a wagtail on a pole. Faster. Easier to use. More thorough on frames. Can clean con roofs. Plastics. Solar panels. Looks more professional. Can clean much higher windows so on so on.
Opens way to soft washing n other ventures too.
Iv trad for 14 yrs. Last yr switched to wfp. I was convinced it was a waste of time as i took soo many customers who didnt like it.
Honestly wished i switched a long time ago! Came to realised like trad working, its not the equipment but the person using it to either do a good or bad job!
Skip getting a trolley as well, as thats a load of stress faffing with water.
Overall advice, dont be put off by negative comments of custies about wfp. Dont waste time faffing with wagtails. Invest in wfp, go thru pain barrier of learning curve and enjoy easier working and new ventures