I fitted the $20-? Ali Express caps and they do the job, let you fine tune the precompression on the fork spring to suit your preference and perhaps better match the rear.
And balance, front to rear, is just as important as any abstract setting.
They are also a quick and easy way to experiment with ride height, which can make a substantial difference to turn in, stability and general feel.
When my rear shock failed I fitted the complete YSS kit, including fork valves, but I preferred the forks before the change.
And the shock was little better than the dud it replaced, even after a good bit twiddling with the adjusters.
With the correct fork springs very little compression damping is required , except perhaps at the extremes, and the forks with YSS springs and valves were simply too stiff in compression, and I could not dial it out with the adjustable caps.
Removing the tank bag and shifting the load to the rear rack made a surprising difference and almost got me there, fine tuning sometimes does not need much of a change!
Ohlins have a fork kit which includes adjustable caps but not valves, full details are on their site so the pricy kit can be replicated much cheaper, but of course it is made to match their shock.
Racetech also have suggestions for the Hima set up, a lot different to Ohlins but again hopefully it will match with their ideas for the rear.
YSS info is hard to find, but what I have seen suggests they are closer to Racetech than Ohlins - that is, stiff and overdamped.
Not a problem if you have the same skill set as Harris Bros and can fine tune the kit to suit you, the terrain you ride on and the load you will be carrying, but most will have neither the skill or the inclination to respring and revalve kit which should be a lot closer.
Stock kit works way above its pay grade, improving it involves not only much more expensive components but also the skill to tune it , and you have to learn that yourself , not much you read/ view is much help!