Feature phones are mobile phones that comes with features such as the capability to browsing through the Internet and store data and play music but does not the advanced operations of a smartphone or computer.

Feature phones, of course opposite of the word "smart phones". Are they really dump, what are we to call standard cellular phones, old desk phones, phones like Nokia 3310 would be called what?

These kind of mobile phones were primarily meant for consumers who wished to have a multifunctional mobile device but may be due to lack of enough funds or intentionally refused to dip their hands into wet side of the pockets to get a smart device.
Summary of Some features available on features phones includes:
Supports Voice calling
SMS support functionality,
Some basic multimedia functionality
Internet access,
Possesses some productivity apps like calculators, organisers, etc.
Some of the services offered by the user's telecom service provider.
*Rumours says feature phones will soon support 4G LTE service.*

Feature phones tends to use They also tend to make use of software and User interfaces that are branded, specially-designed for the phone unlike the mobile operating system generally used in smartphones such as Android, iOS , Blackberry OS, Windows, Symbian (though no long in production) and so on.

History had it that the first cell phone was the Motorola DynaTac which was released back in the year 1984 and was considered a feature phone if we are to use the recent standard for classifications of mobile phones in terms of feature and smartphones. Smartphones was introduced the mid-1990s but was made popular by Blackberry incorporation (then research in motion, RIM).

Feature phones became so popular in the early 2000s, all thanks to Nokia and Motorola brands that produced best-selling feature selling phones. Recall that Nokia 3310 sold more than 100 million units in year 2000.

The introduction of Symbian OS by Nokia, iOS by Apple Inc (around 2007), Android by google and other OS(s) brought the thought to many that the end of feature phone may be at the corner but they all seems to be wrong because feature phone may leave forever.

One of the major factors that may elongate the use of feature phones is just SIMPLICITY, easy to use in terms of navigation (some even have dedicated button for some services). They also very RUGGED, screen does not break easily especially those in smaller sizes with physical button...
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http://www.tellforceblog.com/2017/02/reasons-why-feature-phones-may-live.html

The re-introduction of the popular rock with me -Nokia 3310 gives credence to your assertion , see the new Nokia 3310 details here http://www.phonereporters.com/2017/02/nokia-5-nokia-3-and-a-2017-version-of-nokia-3310/