Obsolescence: sad and true.
IIRC in the early 1990's the new Whirlpool/Kenmore DD designs were scoring higher in CU's ratings consistently enough that GE went the way of the bean-counters and abandoned the FF design as well as the Louisville factory and its community of designers and workers and went with the competitor's lead. CU always maintained that lint removal in a washer was not such a big deal and measured "linting" propensities as well as "lint removal" abilities. No surprises here.
The Filter-Flo design became obsolete (remember who is writing this). When European horizontal axis designs landed on our shores, finally, with augmented capacity, near-ideal water economy and truly automatic dispensing (admit it, you have to look hard to find an American top-loading washing machine (almost always exclusively TOL's) with a synthesis of dispensing and cycles that really allows the user to load and set the machine and never return to it until the load is ready for drying). I know some folks criticize the use of too little water, I haven't noticed that water amount in these machines makes much difference to the final cleanliness of the load. And no vintage machine that I know of can hold a candle to one of the front-loaders that can heat water to any temperature above 150 degrees especially when laundering very dirty white chef uniforms.
I suppose if I had a dog and didn't own a dryer things might be different although these days I'd probably use a Filter-Flo just to wash the stuff the dog uses. Ticks are hardy little monsters and it wouldn't surprise me if they are able to survive a complete cycle. They would, most likely, end up in the filter pan.
I'll never forget how shocked I was the day I figure out how to lift the cabinet top off of our Filter-Flo to watch it while it agitated. I couldn't believe how much water was just sitting there in that outer tub, just for the ride.
You all know how much I love most vintage machines, especially FF's, but daily driving is daily driving.