It never made sense that Dexter could build up such a massive laboratory without outside funding, and also without heavy industry, or precise instruments, or exotic matter, or eldritch knowledge... just from a then-median income, seemingly average American household, not even as an adult, in less than a decade, without personal income or knowledgeable mentor, while still being disrupted and misunderstood
It's fine if you nerf it somehow like it only works on lower tier enemies or there are limits as to what you can do in time stop or any other nerf but unlimited true time stop just can't be balanced in dnd.