Allo French Goupil!
Ca và?

(that's my limited French

) a big welcome, i hope that you'll stay, it's a great place!
Really interesting this, FMA linked to bali-songs

(i'm a tad out of recent FMA training so sorry for any mistakes in technicalities)
IF, we're talking sinawali/redonda (chaining, flowing) drills here i just wanted to share my thinking on this.
My idea is that it's bad to cross one's arms repeatedly, crossing one's arms (might) make it easier for your opponent to trap your arms.
I definitly agree that it'd be
VERY hard to avoid being cut by a properly trained individual when he/she's doing redonda/sinawali, but i don't feel that it might be the ultimate way (due to the trapping risk).
I don't really agree with that it's easier with knives then with sticks, it's quite important to have proper blade (edge) orientation when cutting/slashing, otherwise you'll get a bad or no cut. (in my experience hitting hard with a blade that it's not properly edge oriented might cause you to have the knife ripped out of your hand due to it getting snagged in clothing)
Sticks has 100% hitting area, as you can hit with it all around itself.
A knife obviously has to hit with the edge to make a cut, most knives only has one edge, or at the maximum two edges.
Just my 2 cents. Interesting discussion

(please note, all the cutting i've done is to cutting dummies and to sparring partners with drones, NO actual "street" confrontations, thankfully)