You may think using of framework is better than doing core coding, but I don't think it is good to use framework. Here are some malfunctions of using of frameworks:-
1) Too much unnecessary codes
If you have used either of frameworks like laravel, codeigniter, cakephp (PHP) or spring (Java) or bootstap (HTML/CSS), you can understand how much unnecessary codes, you have to apply for a simple task or apps.
2) You may forget the core coding techniques
When you use frameworks, most of the core coding techniques are not used here, you may forget core coding in that particular programming language. Suppose, you are a php programmer, you uses wordpress framework to build a website or cake php to build a php application, then you must follow their coding syntax ditto. Hence you will be decreasing your creation ability.
3) Slow Application
The another unusual and most important demerits of using of frame is consuming of too much time for loading of application since it uses too much unnecessary codes which also must be loaded first along with your apps codes.
4) More Threats of Hacking
Most programmers use frameworks for easy coding, easy MVC architecture and fast apps development. Therefore it has high threat of attack of hackers because they properly know the coding techniques, flow of your application's codes and also the weakness of your apps. In some cases of use of bootstrap, you can steal the whole website. Because you properly know that the site is using bootstrap. So you do not have to be worry about the css and jquery which are using in that website.
5) Deficiency of programmers creation ability
Using of Frameworks in programming decrease the new creation of programmers. It is one of the most considerable shortcoming of framework use. Programmers mostly waste their time in the following of coding syntax of frameworks. They mostly forget to use their own creation.