If it works, it works. Sounds good to me. Washing things before processing can take a lot of time.
I usually pick beans for canning in a 4-gallon bucket, often two 4-gallon buckets worth, and just rinse them from one bucket to another. I try to be careful when I'm picking them to not put that bucket where debris falls in but you can still get a lot of trash, especially blossom ends and bits of broken dead leaves. I'll often go through 4 or 5 rinses to get them clean enough. Where I wash them is right next to my orchard so the waste water is thrown under trees to water them whether they need it or not. Usually they can use it the time of year green beans are ready.
One trick I've learned with my bucket system if things are really dirty is to use three buckets. The first one has the beans. Fill it and the other two with water. Rinse beans in the first bucket and then rinse them in the second by the handful. Then put them in the third bucket of water. When the water in the second bucket gets dirty enough that the debris is carrying on over into the third bucket, change the water. This takes more water but cuts back a lot on how many times they need to be rinsed. I don't usually do this with beans but more often with herbs like oregano that I'm getting ready for the dehydrator.
I can see your washing machine making this a lot less labor intensive for beans, especially bending over the buckets. Not sure how well it would work with herbs but maybe?