“While we didn’t end up moving forward with it, we’re excited about other ways we’re making delivery faster and more efficient,” Andy Fang, a founder of DoorDash and the company’s chief technology officer, said in a statement.
A similar lack of enthusiasm among users and developers has limited adoption of the iPhone’s 3-D Touch feature, where a long, hard press on an app sometimes offers additional options such as viewing an email without opening it. And sales of the Apple Watch have been hampered by the steep learning curve it requires of users, who must master pushing, turning and tapping various parts of the watch and a related iPhone app.
“There’s just so much stuff,” said David de Min, chief executive of Velapp, a start-up based in London. “They are trying to cram things in.”
Velapp has just released a video recording app that uses 3-D Touch to help users select the best parts of a video while recording it. But Mr. de Min said that few other developers were using the technology, in part because iPhone users were unaware of it. “It’s not something you can really see.” he said. “People don’t understand it.”
Apple, which declined to comment for this article, makes many updates that are popular with users, from changes to the Siri voice assistant to automatically transcribed voice mail messages.
At this year’s Apple Worldwide Developer Conference in San Jose, Calif., the company is expected to introduce improved Mac computers and iPads, software updates for all of its hardware and a voice-activated speaker to compete with Amazon’s Echo and Google’s Home.
With Apple adding fewer major features in recent years, customers have been slower to upgrade their devices.
App developers are also pausing in what had been a race to embrace Apple’s latest innovations. Eliran Sapir, chief executive of Apptopia, an analytics firm, said that new apps were being introduced at half the rate they were a year ago.
Apple TV apps are hot, he said, but developers are fleeing Apple Watch. “There is no way to monetize the watch whatsoever,” he said.
The slow uptake of apps for Messages and 3-D Touch is evident in the numbers.
There are 5,000 regular apps and 30,000 sticker apps for Messages, according to Randy Nelson, head of mobile insights at Sensor Tower, an app analytics firm. Only about 3,600 of the 2.5 million apps in the iOS app store promote their compatibility with 3-D Touch.
“You get your new iPhone and you don’t know that 3-D Touch and apps in Messages even exist,” Mr. Nelson said. Although stickers account for 97 of the top 100 Messages apps, he said, some users are so confused that they post app reviews like, “I downloaded these Disney stickers. How do I use them?”
That is not exactly in line with the simple “it just works” philosophy that Apple built its business on.
Apple is not the only major technology company struggling to find the right balance between constant innovation and ease of use. Facebook has changed course several times in its approach to apps and bots within its Messenger app and regularly battles feature overload in its News Feed. Google, whose search box is a paragon of simplicity, famously retreated from an attempt to tie all of its services together with the unwieldy Google Plus social network.
Ben Reubenstein, chief executive of Possible Mobile, which makes apps for companies like JetBlue Airways and Turner, said he would like to see Apple simplify and smooth out some of its current features. He said Messages apps have potential if Apple can figure out how to make it easier for people to find them.
Mr. Reubenstein pointed to a feature of Google s as an example of the simplicity that people want. He said he backs up his iPhone photos to Google, which uses face recognition to tag people in the images. For Mother’s Day, Google made it so easy to create quick movies from those photos that he made three, for his mother, his mother-in-law and his wife.
Chalen Duncan, a graduate student in emerging media at the University of Georgia, was so frustrated by the interface for stickers and apps in Messages that he redesigned it and posted his version online.
“At its core, it’s a discoverability issue,” said Mr. Duncan, who worked part time on Apple’s telephone tech-support team during college and hopes to get a design job there in the future. “People just don’t know the stickers exist.”
He said he had to teach his friends how to install and use Messages stickers by sending them multiple screenshots.
“A lot of people will think it’s their fault, and it’s really the designer’s fault,” he said. “People want apps to be easy to use.”