The cheapest groupset on the market should not have more chain drops than the most expensive one, IMO.

I have been shifting under the same amount of torque and at the same RPM in the last 10 years and the only chain drops I had were with SRAM. My friend switched to SRAM this year and he's experiencing chain drops too. He was previously using 105 with no issue. It's easy to blame the user, but in reality, it really looks like an engineering issue.

If you want my unprofessional opinion, the shifting speed of the FD is partly at cause. It's a lot slower than Shimano.