I think rfinderfree looks for a high altitude route between the two airports you choose, and the first, and last, waypoints are along the chosen route, so you may find a SID that will end after the first waypoint, and a STAR that starts before the last waypoint, giving the appearance of including both.

Try asking for a route, like KSEA to PHNL, and you will end up with a like this:

KSEA (0.0nm) -DCT-> LOFAL (28.4nm) -V4-> DIGGN (35.1nm) -V4->
JAWBN (41.0nm) -V495-> WATTR (48.6nm) -V495-> JIGEB (55.1nm) -V495->
ORCUS (63.0nm) -J502-> YYJ (90.0nm) -J502-> ARRUE (122.8nm) -J502->
ROYST (172.7nm) -J502-> YZT (281.0nm) -J523-> YZP (506.2nm) -TR19->
FRIED (593.4nm) -J804R-> EEDEN (746.9nm) -J804R-> SNOUT (943.2nm) -J804R->
MDO (1113.6nm) -Q17-> WUXAN (1198.6nm) -Q17-> HOM (1273.5nm) -V321->
ELDOH (1293.0nm) -V321-> AUGEY (1319.4nm) -V321-> BATTY (1390.8nm) -V321->
OSKOE (1436.7nm) -V321-> AKN (1446.6nm) -V454-> EXIPE (1456.6nm) -V454->
DAJOB (1475.4nm) -V321-> EHM (1612.6nm) -G10-> SPY (1887.9nm) -G469->
CREMR (2007.5nm) -G469-> PIPPA (2088.5nm) -G469-> ONEIL (2492.1nm) -G469->
NYMPH (2656.5nm) -R220-> NUZAN (2854.5nm) -R220-> NRKEY (3005.7nm) -R220->
NIPPI (3055.5nm) -R220-> NOGAL (3385.5nm) -R220-> NUBDA (3715.7nm) -R220->
NANNO (3755.3nm) -R220-> NODAN (3878.5nm) -R220-> NANAC (4000.7nm) -OTR10->
KAGIS (4188.6nm) -A590-> ONASU (4301.5nm) -A590-> MOE (4369.9nm) -A590->
KARTA (4430.3nm) -A590-> YOSHI (4431.8nm) -Y85-> MAPDO (4468.8nm) -A339->
TAXON (4641.3nm) -A597-> ASEDA (4958.4nm) -A597-> MONPI (5211.6nm) -A597->
RICHH (5472.4nm) -A597-> REEDE (5623.1nm) -A597-> UNZ (5722.9nm) -R584->
JUNIE (5903.1nm) -R584-> GUNSS (5977.8nm) -R584-> TKK (6275.7nm) -R584->
BIRUQ (6625.7nm) -R584-> PNI (6655.7nm) -R584-> HAVNU (6685.6nm) -R584->
LOOIS (7052.1nm) -R584-> NDJ (7231.8nm) -R584-> CURCH (7292.4nm) -R584->
MAJ (7465.1nm) -R584-> MAZZA (8052.0nm) -R584-> MANRE (8605.6nm) -R584->
MCFLY (9159.0nm) -R584-> CHOKO (9270.2nm) -STAR-> PHNL (9445.7nm)

This happens because there are no airways between HQM and SEDAR, so it needs to find another way there.

Notice that the route length is 9445.7nm? That route consists of flying North to Alaska. Crossing the Northern Pacific to Japan. THEN turning East toward Hawaii. And as I said, that's just because there is no airway between HQM and SEDAR, or more to the point, rfinder does not know about airway C1418, and it might not be in the AIRAC you use either.

Seriously, If I was going to fly to PHNL from KSEA, it is only about 2400nm, and this is the route I would use:

KSEA HAROB4.HQM (or ELMAA.HQM) DIRECT TO (or C1418) SEDAR A331 ZIGIE MAGGI3.ZIGIE (this STAR can be used for any arrival runway) PHNL. So as you see, rfinder can give you a bit of a run around when it comes to a route. ;)

Although I use rfinder to help with a route, I still check it out in Flight Sim Commander 9 and will change it if, and where, I see necessary. For better route planing, Professional Flight Planner X is very good. I find PFPX is easier to find the next connecting airway, and I can still throw in a DIRECT TO when needed.

Anyway. It's all food for thought. We each choose our own ways of creating routes, so there's no set way to do it. ;)