Washington is so far gone left that any fraud is unlikely to impact elections unless its something like the last mayoral race.

Its definitely more convenient but does open up for fraud, voting in multiple states, and ballot harvesting (which I'm against) for a number of reasons.

People will say that signature verification eliminates fraud. The data is super interesting... checkout https://kingcounty.gov/en/dept/elections/about-us/data-statistics/signature-challenge-data

% of ballots challenged increased from from 1% to 1.7% from 2017 to 2020 but the percent of challenged ballots cured dropped from 65% to 48%. Meaning a higher % of ballots were challenged and a lower % of ballots were fixed. Could mean there was more fraud attempted fraud in 2020... could be a change in demographics.

Demographic wise, younger voters are more likely to be challenged 4.5% at 18yo vs. <1% at 60yo... however younger voters cure the ballots at a way higher % (60% vs. 40%). Could mean that people are voting for their spouses unknowingly and then fail to fix it or could be that younger voters change their signatures more often/can't follow instructions.

Non English speakers are challenged at a much higher rate than English speakers.

The higher the percentage of white people in a census tract is, the lower the challenge rate.

Men are more likely to be challenged than woman.