I think "trophy" is a relative term depending on alot of things, skill level of the angler, experience, numbers of fish caught of a certain species or even the age of the anler.
Some folks consider a 5 pound bass or 8 pound pickeral to be trophies while to others their just the norm and hardly get a 2nd glance.
Same thing with Kawartha muskies and many folks would consider a 45 incher a fish of a life time and would definetely class that as a trophy and that's a good thing.
The main difference with the Kawartha musky is the sheer number of them compared to Gbay, Nippissing, St. Lawrence or Ottawa Rivers and one angler getting 4, 5 or 6 muskies in a day is not the least bit uncommon and multiple fish over 45" in a day is quite common to someone with a bit of experience and knowledge. I once boated 9 muskies in 2 1/2 hours on a K-Lake.
There are still plenty of fish in the 48"-49" range, although not as frequent and take a bit more work but are still relatively easy to get with some decent work.
Fifty inch seems to be the point that most Kawartha fish stop growing and getting them that size takes alot more work and hours on the water and a 50'er is a trophy class to me and over 50 is fairly rare.
My biggest to date in the Kawarthas wasn't measured or photographed but my partner and I both guestimated her at 52 inches.