I would like to point out something that may or may not be a solution to the proposed change if it is entered as is.
When you have the symbol size increase trait, cast Symbol of Swiftness in front of you and run across the entire symbol you actually get buffed twice. If you watch your swiftness icon it will refresh just before you leave the symbol. Currently this only adds 1 swiftness so it’s understandable if nobody has ever noticed this before.
This means you will at the very least get 7 seconds with this trait if you use it this way if they make it 4 seconds. Or 9 seconds if they up it to 5 seconds.
Just something to keep in mind for pve roaming and wvw solo running to places. It’s only ten points to get that trait.
I’m not defending the change, I’m just pointing out a possible mitigation to some of the downsides that I haven’t seen anyone mention yet.