By flowing in some lower melting point solder (preferably old school LEADED 60/40 or 63/37 rosin core), you have just effectively LOWERED the melting point of ANY newer technology 'lead free' solder joint. The days of manufacturers using lower melting point 'leaded' solders are LONG GONE.
You have obviously never experienced the misfortune of a LIFTED CIRCUIT PAD OR TRACE in a valuable yet delicate piece of electronic gear! As a former military radio service tech who worked in engineering for nearly 20 years with a MIL-SPEC soldering certification, I will explain the PURE LOGIC of ADDING MORE SOLDER before de-soldering and removing ANY component ESPECIALLY an SMT/SMD component on ultra delicate circuit traces.
