Flooded lead acid needs to be topped up with distilled water, and shouldn't be kept near living quarters due to possible outgassing. If you run them dry, you will permanently damage the batteries. To recycle them, you have to drag them somewhere automotive. The premium you pay for LiFePO4 over lead acid is almost no maintenance and you can drop them off almost anywhere electronics are recycled to enter the recycling supply chain.

Batteries are going to improve rapidly over the next decade, and the battery you replace your current LiFePO4 with at end of life is likely to be much better when that time comes.