The tests are, however, hugely important. Even more so than back in the day when testing was unlimited, and took a big chunk of team budgets. Back then a factory squad or a tyre supplier would book a circuit anywhere from Barcelona to Brazil for three or even more days, and riders would flog round unhindered. And then do it again, if they felt it necessary.
It is very different now. In common with modern motorsport practice, MotoGP strictly limits testing, among other cost-saving restrictions. The most salient in this regard being the freezing of engine design. Already restricted to four cylinders and 1000cc, no modification is allowed for the rest of the year after the opening laps of practice for the first race. Any flaws or weaknesses in the power units are there for the rest of the season.
It may seem surprising that there should be any. A MotoGP bike has a surplus of horsepower, held in check not only by the rider but also by the electronics. There’s more than enough. Why is more engine development needed anyway?
Because it’s not only about power, but the nature of the power. If it can be made more usable, then the rider can use more of it. That’s why the work goes on.