the ER-L is basically end of life at this point. UI trying to bake in new features has resulted in a lot of broken updates.
Keep in mind - this thing launched in 2013? Imagine your smartphone back then, basically same hardware. It's what put ubiquiti on the map, like the OG iphone.
Go big dick with ubiquiti and you will have an amazing time.
Also fuck pfsense, go vyos