But government has limited cash to spend and a lot of deserving causes to fund. That which is spent on SequenceME cannot be spent on new hospitals, the benefits system, national defence or a slew of other options. Public funding is a zero sum game - what one cause wins, another loses - so economic impact assessments are a reasonable part of that.
It's also important to point out that most medical research is charity-funded. Governments mostly do basic research, and generally provide little disease-specific funding outside of top killers (heart disease, cancer, etc). This is mostly missing from the equation here, because the illness has no legitimacy and no support from the industry.
It doesn't have to be a zero-sum game because most of that funding doesn't normally come from government coffers. All of this is a consequence of decades of denial, and governments can easily make up for it with very little actual spending, by supporting, encouraging and leveraging the charity sector to contribute, by removing the illness from the shit list. Charity funding could easily be 10x larger without governments spending a single cent.
Had the medical profession taken this position all along, "we don't know what to do here, we are out of our depths, don't even know where to begin, but we encourage and will work to support all efforts at solving this, but we are unwilling to put our own money into it because we rarely do that, and until then everyone loses", we would already have meaningful solutions.
Governments are already spending billions on this issue, they just never see the bill. Having others do the work for them can work just as well, but this requires forcing the issue, using the power of government to stop the denial and blockage that medicine forces. It's not just about money. Money follows legitimacy. Governments can provide that legitimacy with very little money, but it will require swallowing the biggest damn ego pill in history.
I'd even say that ego is a much bigger problem than money, especially since it was always far cheaper to just do the damn work from the start. However liable governments and medical institutions are for this disaster, they are immune from actual consequences, so they should not worry about it. If they ever have to face consequences, all the gains from returning millions of people back to a normal life will more than make up for it anyway.