Not everything in Gamedevelopment has to do with coding, thats the main point I don't get. Why should the People responsible for desgining new ships stop working? They don't interrupt or hinder people who work at bugfixes in anyway.
Also not everything effects everything, a bug may be a problem for certain new addition but it also can be absolute none for others, bugs also may not occure on every setup. Theres a reason there are bugs Players discover the Devs never have seen. Its really not all that simple, not everybody is suited to work at bugfixes and simple tell people to not work does not make any sense. Not to mention that just putting more people on the same task may not actually change anything.
Look, better bugfixes yes there is certainly room for improvment. But "stop doing anything that is not bugfixing" is a bit silly to ask. Diffrent people are hired for diffrent tasks with individual skillsets, you can't just say everybody go do A thats not how that works.