That Friesian/Saddlebred takes after her Friesian sire. With the exception of a small star on the cross they could be twins. Same look, size, build, behavior.
I've always been at a lose for where some people came to think that the Friesian is a carriage horse (no more so that the Lipizzaner, which also had a version bred as a carriage horse prior to the WW)
The classical Friesian, ridden for centuries, is a classical baroque horse. Like the Lipizzaner. Not so long ago, before WW I, some breeders started breeding slightly heavier Friesians for farm work. There were already some being bred lighter as a result of Cav being lighter. Between the 3 types the differences are not very significant. The classical baroque Friesian is still a solid, strong, dependable riding horse. The heavier type is just a slightly heavier version of the baroque type. The light version a bit lighter and looks very much like a Frisian Sporthorse. Both the baroque and light types can jump pretty well (contrary to what many people seem to think :lol

. The baroque version will be less likely to win a race against the lighter one, but they have the strength, build and personality that made them great heavy warhorses (which is why the nobility loved them so much if they could get them).
My Friesian crosses bare no resemblance (physical or emotional) to their mothers. With the exceptions of the white on their face they look like their Friesian sires. The heavier, but shorter, baroque one loved to jump the 44" fence that divided the pasture so we had put up a higher line on top (and explained why the breeder didn't have shorter dividing fences :lol

. The lighter one has the same sporty build of her sire. I've yet to find anything of the Saddlebred in either of them. Their behavior, build, performance is just like their sires....except that their sires were 17 hh and 17.2 hh so my mares are shorter than their dads.
With the possible except of the younger one loving to stick her tail up like a flag pole when she's strutting around the pasture. That is a very Saddlebred behavior.
That Friesian crosses can successfully compete in distance races (even if they don't win

) should not come as a surprise. They are more likely to have the heavier cannon bones and wider loins that makes them better suited for carrying the riders weight with less negative impact on the horse.