limit journal to 1GiB on large block devices.
limit journal to 1GiB on large block devices.

why?

if the journal backs up larger than that, you have a serious problem.

furthermore, certain types of devices, such as HDD (which should never
be used for the journal but traditionally have been) have serious
performance falloff up to 50%, so using a large majority of the device
would seriously negatively affect performance.  see:

https://www.psc.edu/media/zest/diskperf.png

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable