Automatic lint filters were available relatively early (my '65 Whirlpool set has an automatic lint filter). Looking at the construction, however, I think they were phased out in later models, in favor of the edge-type filter, because the edge type was cheaper, and perhaps because marketing thought that owners were happier to actually see the lint. My '83 Whirlpool washer had one of those edge filters, and I hated it. It didn't catch much, and what it did catch was nearly impossible to clean off the teeth.
I tend to doubt that manual lint filters do much to protect drain plumbing. If a drain system can't handle soft washer lint it's probably got other major problems.
With front loaders most lint gets collected by the dryer lint filter anyway. I've also noticed, at least with the Neptune, that some fabrics produce far more lint than others. Like bamboo fiber throw rugs. Major lint producers in the dryer. Soft fluffy cotton towels, much less. Average load, mostly human and pet hair shows up in the dryer filter.
I tend to doubt that manual lint filters do much to protect drain plumbing. If a drain system can't handle soft washer lint it's probably got other major problems.
With front loaders most lint gets collected by the dryer lint filter anyway. I've also noticed, at least with the Neptune, that some fabrics produce far more lint than others. Like bamboo fiber throw rugs. Major lint producers in the dryer. Soft fluffy cotton towels, much less. Average load, mostly human and pet hair shows up in the dryer filter.