The biggest problem with pet sc'ing is this:
1) Its worthless inside abyssea
1.a) You cant use it on exp mobs, they die before it goes off
1.b) you wont use it on +1/+2 mobs cause the mobs at 40-60 % before all procs go off, and even then you are usually on blm/brd/blu/whm/mnk/war
1.c) If your using rr/ss/apoc or rr/gh/apoc neither you or your pet will have tp, you have to use SD or VV which means you have slightly less dps for everything else

2) Outside of abyssea its incredibly useful if you get it to go off, but currently for me its about 3 of my ws before the pet is ready and even then on an exp mob, its dead from either my ws or the pets ws.

3) Which leaves you voidwatch, a situation where your pet is more likely to die from ae then get the tp to ws skill chain, and add in the 15+ other people spamming ws at the same time, you will never get that skill chain off.


TLDNR:
Skill chain is good, and nice for epeen numbers but unless we get a sam type ability to 'force' a pet ws even without 100tp 1 time every 5 minutes, its too hard/wasteful 95% of the time to even bother trying for them.