Yes and no. Tryndamere is definitely lower in mechanical intensity than Yasuo... well acually that may be wrong, Yasuo generally has the same amount of options, they are just flashier and have very apparent power spikes.
A fed Yasuo is going to disassemble someone in approximately the same way as a fed Trynamere.
But a closer comparison is probably to Thresh who I would have to say is more decisional intensive than "mechanic" intensive. A Thresh that knows when to throw a lantern/hook/flash engage is far superior one that always lands hooks.
High level Tryndamere play has a large number of decisions and nuances. It is rarely as simple as spin aa ult.
There is rage management, auto canceling(crit saving for csing), orb walking, backspin, map manipulation, healing timing, ult timing(requiring burst potential knowledge), csing ( his laning potential is low, if the opponent is losing in lane more than half the time it is because they are not abusing his weaknesses ), burst mitigation/cs spoiling with w and it goes on.