"Processing mail takes time because election officials must ensure that no one has more than one vote," he said.
"And counting ballots has also taken time because we have many safeguards in place to prevent fraud," added Ford, "such as signature verification, unique bar codes and other tools."
Ford says officials knew the ballot counting process would take some time this year and adds that our counting procedures are overseen by a bi-partisan board in each county.
>>source: https://www.ktnv.com/news/political/elections-local/state-of...
In swing states however, the probability of uncounted votes changing the leading candidate is much higher, which is why the news is focusing on them.
All of the states are still counting votes, it just won’t matter in Oklahoma or California. For the president that is. Down ballot elections are still contested everywhere. Illinois which was predicted for Biden moments after the polls closed has a Congressional election that is coming down to provisional votes and this hasn’t been called yet.
https://electionresults.sos.ca.gov/unprocessed-ballots-statu...