My December 2016 Hyundai I10 full gadgets does not care for 100 watt and roof mounted antenna from the FT100 on HF, nor 6 meter nor 50 watts on 2 or 20 watts on 70 Cm.
Most car manufacturrers just don't want to be hit by lawsuites so they stay on the safe side with claims what you can get in the car and power used.
Yes i have an OBD2 system, read it out myself here.
In case of doubt use ferrite near computer and the other computers for air bags etc
Bond everything well, i didn't run more as the 100 watts from the FT100 thoug, it is a bit difficult to drag the Heathkit SB-1000 in the car and run that long extention cord
Are you saying does not care - as in you have no issues?
Or
Are you saying the system does not care for the wattage - as in it does not like the wattage and it causes issues?