Typical card-counting, which treats 2,3,4,5,and 6 as "+1" and 10's as "-1", requires card counters to keep track of each card as it's dealt. I wonder if you can get a reasonable approximation of this by just counting the number of cards that are on the table and ignoring what cards they are.
For example, when a player stands after exactly two cards, they usually have something like 10-8, 10-10, 9-7 (against dealer 6), etc. so the count is usually negative. If a player stands after three or more cards, there's usually a 2 thru 6 in there, often more than one, so the count is usually positive.
Through simulation, general averages could possibly be determined; for example, hypothetically, Two cards = -0.75; Three cards = +0.6, Four cards = +1.8, Five or more cards = +3.25.
I'm envisioning a system where instead of counting +1, -1 as each card gets dealt, you begin with a negative "x" count (under the assumption that each player will use exactly 2 cards), and then increase the count by "y" for each card beyond the second that any player receives, regardless of its value.
Edited to add: This would be a cumulative count, and at the beginning of each new hand you'd continue by again subtracting "x" from your current count.
Could such a system provide enough advantage to be useful to a beginner? Thank you very much.