so yes basic math skills in regards to making change can be troublesome for some because they are so infrequently used.
Emphasis is mine. If basic math can be troublesome in making change because basic math is so infrequently used, then it also stands that basic math can be troublesome in other areas of everyday life because basic math is infrequently used.
Can you honestly tell me you haven't had the "discussion" with a teen over why they have to use basic math when their smartphone has a calculator?
That honestly sounds like you're making more work for yourself. Whether it's necessary or not is dependent on your group but that's not a flaw with the system. If I tracked everyone's hit points in my D&D game it would also cause an exponentially greater work load for me. That's not the system, which despite any flaws has been a staple for decades, that's a decision I made for my group.
That is a false equivalency.
Hit Points in D&D are updated less frequently, and at the
end of a significant action. The bad guy hits you, your team mate heals you, etc...
The action is determined, and resolved, and
then you record the result.
Edge in Sixth World changes in the middle of an action. It can happen multiple times, both increasing and decreasing, in the very same player turn. D&D Hit Points do not fluctuate that fast.
On top of that, being off on Hit Points by 1 or 2 will rarely change the outcome of an encounter.
Being off by 1 or 2 Edge Points is much more significant in Sixth World.
Yes, but it's also only one of two pools the players are tracking as there's also Luck/Fortune/Determination (depending on which variety of 2d20 you're playing) which are functionally different than Momentum.
That is also not entirely true. When I run ST:A, it is almost always on Roll20. There it is so much easier for me to be the only one to track Momentum. I'm the only one with authority over the tracking token, and I'm the only one who has to do math.
For Determination, that too is a metric drek ton easier to track than Edge because it happens much less frequently, and it occurs (other than when you spend it) because of a fairly significant RP situation.
It isn't "tracked in the background"
during other actions.
Remember, Edge is supposed to speed up combat - not require referencing flow charts.
Again, this may not be a problem at many tables. That doesn't mean it doesn't exist. That doesn't mean it is okay to deliberately overlook those that it can affect.