sure, you will miss rails if you are still working on monolith development model (which is still valid in many cases) or if you want to have your Ruby developers who can also do frontend work.
These days, frontend has advanced so much that either you are a minority who is truly full stack and can do both backend and frontend work in good competence otherwise, frontend has become a separate profession altogether and for good reason -- it not only requires artistic capabilities, but it requires good amount of coding now with plethora of frameworks/modules.
Rails is a great framework no doubt but advent of React/Angular along with rise of microservice-oriented architecture has limited the footprint of rails in job market.
These days, frontend has advanced so much that either you are a minority who is truly full stack and can do both backend and frontend work in good competence otherwise, frontend has become a separate profession altogether and for good reason -- it not only requires artistic capabilities, but it requires good amount of coding now with plethora of frameworks/modules.
Rails is a great framework no doubt but advent of React/Angular along with rise of microservice-oriented architecture has limited the footprint of rails in job market.