Will PLA have any flexibility at all?

[EagleSeven]

Note: there is a Difference in the filament being brittle
and the printed object being brittle.

Poor quality (brittle) filament can still print Good objects
if you are careful when feeding filament into printer.

Once the moisture and air are cooked out, when extruded, it may still be good
enough to make good quality prints.
That greatly depends on Speed settings of print.
Usually Need speed a little slower for brittle filament.