Computers are not yet sufficiently advanced to work with exact numbers in quantum physics. For many years, physicists used unrealistic point particles in their models, because the math of using realistic 3D particles was impossible to do by hand. This led to nonsensical results, since quantum effects below the Plank length become extreme. When computers became sufficiently advanced, they switched to unrealistic 2D strings longer than the Plank length in an attempt to get better results. However, even the fastest computers cannot work out the exact equations for 2D strings, so they use approximations instead.
The approximations are not sufficiently precise to work out the details, so physicists are left with thousands of possible string shapes to work with. 2D shapes are also unrealistic, even if computers could work out the 2D exact equations. In reality, all matter has at least 3 dimensions, but computers can't even work the approximations with 3D shapes. String theory requires that particles have at least 11 dimensions, so it may be awhile before computers become advanced enough to work with the math.
So we are closer, but it could be awhile yet before physicists can work out the details. All they have now are thousands of possible particle shapes and theories, with no computers capable of working the math to figure out which one is correct.