A tablet for drawing does pay off, but it really depends on what you want to do. If you're just getting into digital from paper now, the biggest advantage is being able to undo everything instantly, adjust colors without messing up your drawing, duplicate layers... stuff you just can't do on paper. Plus, you get unlimited brushes without wasting materials, so you save money in the long run. For people who actually draw digitally (illustration, concept art, design), an iPad with Pencil is a game-changer because you get pressure sensitivity, tilt, everything feels natural. But there's a learning curve - at first it feels weird not having that paper texture, and the apps have their own ways of working that you need to learn.
The upfront cost is definitely high, I'm not gonna lie. An iPad with Pencil runs you like R$ 3-4 thousand minimum depending on the model, and then you gotta consider if you're gonna use paid apps like Procreate (it's like R$ 80 for the full version, one-time payment). But think about it this way: if you draw regularly, in the long run you save on paper, erasers, colored pencils (which are ridiculously expensive), and you also get the ability to sell your drawings digitally, take commissions online, stuff like that. If it's just an occasional hobby, a tablet might be overkill and paper's probably the way to go.
What I'd suggest is try something cheaper first - like a basic Wacom tablet with Android or Windows (runs you like R$ 400-600) and test out free apps like Medibang or Clip Studio Paint free. That way you figure out if your style actually works better digitally before dropping serious cash on an iPad. Some people switched and loved it, others thought it flowed better on paper. It really depends on your drawing style, honestly.