I disagree, having just installed 12 SS point motors on both O Gauge Streamline & Setrack Unifrog turnouts.
(I have not installed on hand-built track, but I imagine that they would be OK)
Admittedly they need careful installation & setting-up.
For instance, they are very susceptible to being screwed down too tightly, and they seem to work better if the motor is on the same level as the track base.
Adjusting the throw on the control box also needs to be done with care.
Because of this sensitivity, I can imagine that they would not be a good idea for a portable or exhibition layout.
However, they work well on my loft layout, which cannot have any under-board wires etc, because of storage requirements.
Due to lack of info regarding SS Point Motors and O Gauge, I may put together a short article on my findings for the DCC Concepts "Focus Forum" - https://www.dccconceptsforum.com
Tim