I don't understand how that would limit evolution. Bigger bodies can evolve together with bigger hearts, as already witnessed with the very whales being researched.

Privacy protection has the exact same issue. Wiretapping laws were created at the time there was literally a detective listening to a private phone conversation as it was happening. Now we record almost everything online, and processing it is trivial and essentially free. The safeguards are the same but the scale of privacy invasion is many orders of magnitude different.