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These are indeed part of the solution and are known as baffles. They have risks of their own, e.g.: https://wccftech.com/baffling-baffles-musk-explains-why-spac...

In the first spacex rocket Musk thought that it was a good idea to not install baffles. He learned from experience that they are indeed needed.

I remember a very similar anecdote about Von Braun & the early Juno/Jupiter rockets - with someone pointing out issues with sloshing on a press conference & Von Braun brushing it off as insignificant.

Then the next launch crashed due to slosh induced oscillation - and the one rocket after that had anti-slosh baffles. ;-)

That’s how tanks in race cars are made. Another solution is fill the tank with some kind of sponge-like material.

That would be far too heavy in this case. :)

Sometimes… the baffles break off, and then become surfboard projectiles inside the tank.

More fluid dynamics

That is how they build the tank in Formula One Racing (and probably many other race cars, I guess)