Don’t boost in digital domain - it will clip given that the peaks in source audio data are often already at or very close the maximum possible peak level or in some cases at the maximum peak level.
While DSP in Roon effectively has infinite headroom, the processed data still has to be converted back into a format acceptable to the DAC (ie what you know of as 16 or 24 bit etc) and at this point and overly boosted signal will clip.
Roon’s pipeline information and peak indicator are about informing the user about the audio quality of the digital processing pipeline which on many system can be quite opaque.
The peak indicator is not too sensitive and I believe it represents a modern industry standard behavior of such peak/over indicators (also known as ‘true peak’).
It is not an indicator of amp clipping of course as it cant know what the output level of the amp is. The problem with a clipped source is if you already have clipping, then as you turn the amp up, you may not notice the onset of clipping (as it is already there) and so you get no audible warning that you are exceeding the amps capability.
A clipped single has more RMS energy than typical music program material, and so an amp’s max RMS output level can be higher than RMS rated which makes it more likely that speaker coils overheat (depending on speaker rating).
I think you need to have a look at the manual of your DAC:
Output rating appears to be as follows:
Output level (Low)
170mV (-15.5dBV) Single Ended
340mV (-9.5dbV) Balanced
Output level (Normal)
1.3 Vrms(+2.25dBV) Single Ended
2.6V (+8.25dbV) Balanced
It appears that two output levels are possible, so I assume there must be a setting somewhere.
Speaker damage is not thing that Roon is able to reason about. It would depend on your amp, speakers, how levels are set, etc. Non-clipped signals can break speakers too–I blew up some speakers with a badly designed filter I was working on once because it dumped all of the energy into the tweeter, which promptly overheated.
The clipping indicator is there to inform you that Roon was forced to do something potentially nasty to your sound quality. It is not really about system harm at all.