Yes, to batteries being dangerous, but that's mainly older model batteries from the "early" days of solar storage. My batteries are much safer for two reasons. Each battery has built in BMS (battery management software that, among other things, does internal checks to make sure it's not overheating, and only if things are in the good does it keep the circuit closed). The other thing is that I have a total of six 48V LifePo4 lithium batteries that store 5 kWh each. Basically, it's much safer to pull a load from many powerful batteries simultaneously than it is to pull the same load from only one or two small-powered batteries and hope it keeps up without burning itself up.
Directly from the panels? Maybe but it doesn’t add up. But it is something that I will consider if/when I look into it. I’d size the system accordingly if it is not too expensive. Of course, it depends on the time of the day, etc. and only a narrow window of time when it can completely power the house.
I am extra careful with batteries these days. I personally witnessed a small cellphone battery destroy a car. The “safety” features failed and the charger kept forcing current into the cellphone battery. The temperature was so hot that it started to melt the windshield. I bet that your battery system has many times the energy than that little cellphone battery. Paralleling batteries is probably safer since each has to provide less current. However, they need to be able to current share equally. I presume that you have it set up in a parallel configuration.