I use the same phone security feature that I use with wallet/keys, other expensive personal items...
... I simply don't ever let anyone else get their hands on it.
It's worked for all these years with a simple leather billfold that has zero security measure to keep any thief from having my: cash, bank cards, drivers's license, SS card, insurance cards, (basically my full identity) AAA, company access cards, etc.
It's also stopped anyone from stealing these jangling metal things that would allow anyone to drive off with five figures worth of automobile or waltz into my house and help themselves to anything in it.
Soo... I trust that this method too will work for my phone also, which has: none of my sensitive information actually available to anyone (personally, I don't know why people act like they keep every bit of private info in plain/unprotected sight on their phones- if you do, it's kind of stupid.) Not a single unfiltered password of any kind. No trace of my banking info for anyone to just auto-log into and view, and pretty much nothing of interest to anyone but me except maybe my latest game scores or maybe a bunch of IM's with such top secret info as "Don't forget to bring home milk..."
Yes, it would suck to have stolen, but mostly because of inconvenience, but not because I walk around with all sorts of OPEN ME: TOP SECRET! files with all my personal data for the world to see.
I suspect, in truth, a lot of people are the same way. Any thief that really would go through a whole bunch of CSI BS just to hack a fingerprint scanner is probably just going to be "unlocking" a bunch of non-info to them. The only thing they'd really be interested in is selling the phone, not going out of their way to unlock it for useless data.
In short: huge non-issue for most non-James Bond types. And James Bond probably would use my wallet/keys method for his phone also.