Windows file explorer lacked tabs when dolphin had them for a decade or so and its still not even close to even the top of file managers. Also its terrible slow, unreliable, crashes often and has 4 different UIs baked in.

Do some plugins for Dolphin, I feel like they are neat because a) other devs that want to implement a function now have a blueprint for it b) with downloads/stars metric that these add-on stores provide you get a good idea of what the community actually wants.

I would recommend anything Thermal Grizzly: https://www.thermal-grizzly.com/

Simply because the owner has two 1 hour long videos explaining how its made and tested and it actually seems to be one of the best.