For example, consider another flight that disappeared mysteriously over the ocean: Air France 447.
https://en.wikipedia.org/wiki/Air_France_Flight_447
It took nearly 2 years to find and recover the flight recorders. Once they were analyzed, the results were shocking: the pilots flew a perfectly good aircraft into the ocean after a relatively minor technical fault. It had a major impact on pilot training and procedures across the globe.
That's why they'll keep searching for MH370. Beyond closure for the families, there's a chance that there was something in that crash that we all need to know.
MH370 is orders of magnitude harder to find, and AF447 was a huge effort.
Do you have any sources for that? Everything I've read has suggested it as possible but never going stronger than probable