The point is that we are almost certainly going to blow past the 1.5 degree C (and likely 2 degree C) mark if we continue to decarbonize at a slow pace. To avoid this fate, we need to do rapidly electrify everything AND we need to remove carbon from the atmosphere.
Direct air capture will never be free, but compared to the cost of future negative climate change impacts the cost of direct air capture could be totally justified. At the very least, it is worth investing in the technology to see if it can become a game changer.
Deploy technology we already have and invest in viable R&D technology. Renewables, better agriculture, hydrogen based fuels, reforestation, changing cement processes, landfill management, capture biogas from waste water treatment plants and ag facilities, reduce high GWP refrigerant uses in countries that still allow them....
We will blow by 1.5 C if you've been watching this space since the early 2000s we've blown by every single warning that we've put up. Theres a moment in time that is happening right now - we waste our political clout and money on CCS or anything on GeoEngineering and it will be a disappointing future.
And no, investing in soil remediation would not incentivize further use of the ICE/fossil fuel burning tech because the oil majors aren't the companies standing to gain from soil remediation (i.e. they haven't spent considerable money funding R&D institutes to evangelize and deploy this tech).
We have to do everything you said and optimize technologies that convert gaseous CO2 into something that can be permanently stored.