As your personal decision of allowable ppO2 at a given level of exertion is what you need to base your judgement of MOD on, .
Without getting in a semantic debate about personal freedom... I don't think any agency teaches a flexible system of ppo2.
If the OP learnt with PADI, then his max ppo2 for planning purposes is 1.4
Having a 'personal opinion' on allowable ppo2 requires knowledge and experience that far exceeds anything taught on a recreational level course.
Just saying....
The MOD is important but is it important it is displayed on the computer?
It shows the MOD when you program in the O2%. But it isnt displayed on the dive.
Dsiplaying the MOD during the dive is only important if the diver concerned had a mental impairment that heavily degraded their short-term memory.
How hard is it to remember an MOD for the duration of a scuba dive?
(
"my MOD is 90'.....my MOD is 90'......my MOD is 90'.....my MOD is 90'.....my MOD is...errr...ummm... oh bugger!")
...and then, of course, you will have included your MOD within the dive planning and briefing... so your buddy will be consiously and diligently supervising that also....
So, having the MOD on your computer screen would only really be critical for divers with the memory recall of a goldfish.... who chose to dive with an equally mentally deficient buddy.
Even then.... you could still write the number on your hand...
That's based both on better data, and also the need to add a safety margin for the weekend warriors.
Wheras us 'hardened nitrox warriors' don't need those safety margins, because we are tougher and more likely to shrug off the effects of an O2 hit??