With the market seeing a half dozen or more buyers for every listing, sellers may feel complacent and just let the front yard go this summer. Sure, you will sell the house and you may even get multiple offers, but you won't get top dollar if your house looks unkept.
No matter what the market conditions are, human nature doesn't change with real estate trends or whether buyers or sellers are favored. People have impressions that can be hard to overcome. The very first impression if the drive up to the house. A nice and tidy front yard and clean look is a positive start to the showing experience for the buyer. That should continue as much as possible. Ideally the first three impressions ought to be positive before the buyer starts looking closely. There are often going to be negatives for the buyer even if the house is emaculate because they may not like the layout or other fixed design elements. Having three positives before encountering any potential uncorrectable negatives sets the seller up for a better offer.
People are people and they tend to make decisions based on how they feel as much as the pure logic of the decision. Not every buyers agent is effective at mitigating the buyers emotional side of the decision making process or the logical side, and sometimes they are lousy at both. Setting up the buyers with mostly positive 'feelings' about the house will generate higher offers.
In short, sellers should still keep the yard up, keep the house clean and tidy, and show it often to ensure good market penetration.