I cannot disagree with you more on the fiber glassing of LPR.
At first glance, the uninitiated or inexperienced builder might agree wholeheartedly with your assessment. You hear "fiber glass" and "rockets"... you think of the big HPR monster tubes and think beefy fins! The HPR guys are busting Mach speeds and have birds that weigh dozens if not hundreds of pounds! They use 6, 7 and 9 oz. fiberglass cloth in multiple layers and wraps. This of course adds the desired strength these folks are looking for, but with the added weight. Not a problem for HPR... just use a bigger and more powerful motor!
With the lower power weight is a serious factor! An 18mm Estes C6 tops out at 4 oz. max lift-off weight. So heavy glass isn't an option. When fiber glassing LPR I typically use very light weight .75 oz cloth in a single wrap around a cardboard tube or 1 layer per side of a balsa fin. This adds virtually no significant weight with much added strength and resilience. This gives your rocket a much greater lifespan and durability. There is a fine line between adding weight vs. the need for stronger materials due to it's weight. Sort of a double edged sword so to speak... this however does not cross that line.
There are also many benefits to glassing.
For Body tubes:
Much added strength
Cover spirals and requires much less sanding!
Tubes gain some elasticity and resist dents and crushing
Balsa Fins:
Extreme strengthening (as light as bass, stronger than ply)
Seals the grain.
Let me put it this way. I could smack you over the head with one of my 20" long, 2.75 oz., BT-60 rockets using the fins and the rocket would be fine. You on the other hand would get an "owie"!
Fiberglass materials are generally used in many products because of how strong they are for being so "light" in weight!
I don't glass every rocket I build. It does add a little extra time. The results however are spectacular!
Give it a try!
Jerome