Correct me if I'm wrong.
Without earth's magnetic field we wouldn't have electricity, right?
Because sunflares and cosmic particals would cause EMP strikes on our power grid and electric devices and they would shut down. Right?
Even our skin wouldn't be able te handle te sunlight.
How does electric devices such as satellites and robots in space and on Mars survive or even work if those places are unstable environments where there's no protection against cosmic particles?
Keep in mind if the magnetic field of the earth flips our devices and power grid wouldn't work either.
I also found this in an article
However, if the magnetic field gets substantially weaker and stays that way for an appreciable amount of time Earth will be less protected from the oodles of high-energy particles that are constantly flying around in space. This means that everything on the planet will be exposed to higher levels of radiation, which over time could produce an increase in diseases like cancer, as well as harm delicate spacecraft and power grids on Earth.
I would agree that the weakening magnetosphere does open us up to increased effects of charged particle, but would disagree with some of your points
UV light is blocked by the ionosphere and atmospheric gases and the only possible effect to increasing solar burns would be IF the weakened magnetosphere allows the solar wind to strip off a significant portion of the atmosphere which is unlikely.
Satellites are engineered to withstand vacuum, radiation (solar and cosmic), Temperature flux, etc before they are even launched. Newer satellites are almost over engineered and survive longer than expected.
The power grid is only in danger if a solar flare or CME would make a direct impact with Earth. The magnetosphere does offer protection against this, but it also completes the Global Electric Circuit that allows the radiated energy to transfer from the field and connect with terrestrial systems as it flexes and absorbs. In a weakened system, it is possible to be overloaded more than likely lead to direct connection (I.e. lightning). A larger X-Class Flare or CME would wipe out the grid anyway but we have not taken a direct hit in a Century maybe more.
There are larger implications for the timing and of the reversal and the overall Cosmos effects that can be seen. If the implications play out as Catastrophism is predicting based on observations and record, being in the stone age without FB may be the least of humanity's concerns.
Check out Suspicious Observers on YT or suspiciousboservers.org. They have a good series on it and daily updates for the field.