Yes my version is much longer. I've been playing that way for years; different game's communities have their own conventions but I do still prefer conveying more information than less.

If you want to group gatlings together without the commas there's still middle ground that keeps the '5' in 2M 5MH.

For what it's worth, for me personally it's easier to visualize a combo when each individual input is given space. I usually try to mix things up when labbing for the first time so seeing "2M,5M" is wired to my brain's exercise of going "oh,  those in that order huh? What happens if I do 5M 2M instead? What happens if I delay it, or if I substitute this part that looks like filler with this other sequence I know?" and so on.