When connecting a PEX-A tubing to an existing copper line and the PEX-A adapter is already sweated on, do you cut the PEX-A tubing just the right length and make the connection?

I am asking because I usually have slacks say 2-3' at the end when I ran the tubing initially, and I know when I do electrical wiring if I have slack I would just loop the cable in the stud bay before inserting into the box, so that any future modifications have extra wire if necessary instead of just cutting them short.

Should PEX-A tubing be cut to the right length when making connections, or is looping the excess a bad idea?

The reason I ask is, let's say I cut it just right and make the connection. If there is a leak when I test it, the expanded tubing and collar can't really be reused, I have to cut that out, now the tubing is too short to make a new connection, like an inch or two too short, which means I have to cut it even shorter to insert an intermediate joint to remake the bad joint. Now I have a redundant joint on this 45' long tubing.

So I was thinking of a way to leave a few inches of excess length (by making a loop or by gently sweeping a curve one way and than back) which allows me to remake a joint if necessary, or am I overthinking this?

make a loop