Asset econ is good because even if the runner does trash all your assets, they are poor and you ahead in the econ battle. There was a time before asset heavy decks when Whizzard was considered one of the worst runners. But with the rise of asset-based decks, Whizzard not only because a good option but has probably been the best runner for at least 6 months.
Two ways to deal with asset decks is to check all their remotes and trash all the SanSans, Sensies, Bankers and anything else that will advance the corp too quickly. From there you either steal agendas that they play out or the agendas will inevitably build up in HQ where you can wait till mid to late game and just take them. The other way to beat asset decks is to ignore remotes and lock R&D so that no agendas get to HQ for the corp to score.
As a counter to this counter, operation econ decks can be much more powerful. If you do not have anything to trash, Whizzard is a blank ID. Arguably the strongest corp deck out of worlds with respect to the current meta, was Ben Ni’s Sync deck that finished 2nd. It fortifies centrals with cheap taxing ICE to the point where the runner has to float tags. Once the runner floats tags, the deck can kill the runner, close their accounts and even get to 7 agenda points without scoring (through Quantum Predictive Models and Exchanging them for GFIs).