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If after reading this you still want try to enforce the kind of workflow you asked for your best bet would be NERDTree. It has the possibility to stay open even if you open new tabs and also to open new buffers always in the right window.
If you want tabs similar to how they work in other editors you could use plugins to create a buffer-/tab-line instead of vims tabs. Here is a small list: https://github.com/astier/vlugins#tab-buffer-line I personally like barbar the most and to be the most feature-advanced. However, it requires neovim v0.5.
This one? https://github.com/lambdalisue/fern.vim