AFTER LNDG LAX RWY 25L; A CL65 CREW PROCEEDED TO CROSS RWY 25R WITHOUT A SPECIFIC CLRNC TO DO SO.

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UPON LNDG AT LAX RWY 25L; WE EXITED ON HIGH SPD TXWY M TO OUR R. WE THEN PROCEEDED ACROSS THE RWY 25R HOLD SHORT LINE PRIOR TO BEING CLRED ACROSS. AS WE ROLLED SLOWLY TOWARD THE RWY 25R EDGE; I BEGAN COMING TO A STOP JUST AS THE TWR CTLR CLRED US ACROSS RWY 25R; STATING THAT AN ACFT WOULD BE IN POS AND HOLD ON RWY 25R AWAITING TKOF. THE TWR CTLR MADE NO COMS WITH US AFTER CLRING US TO LAND; UP TO THE CLRNC TO CROSS RWY 25R. EVEN IF NOT REQUIRED; MANY CTLRS WILL ISSUE A REMINDER TO 'HOLD SHORT' AS WE EXIT; ESPECIALLY IF DEPARTING TFC ARE USING THE CLOSE PARALLEL. UPON TALKING TO THE LAX TWR SUPVR; HE INFORMED ME THAT HE DOESN'T ISSUE SUCH REMINDERS BECAUSE THEY REQUIRE A READBACK FROM THE PLT AND IF THE PLT FAILS TO GIVE THE READBACK; THEN THE CTLR IS PARTLY LIABLE. HE INFORMED ME THAT OUR ACFT WAS OBSERVED PAST THE HOLD LINE AND THAT NO INCURSION OR LOSS OF SEPARATION OCCURRED. CONTRIBUTING FACTORS ARE THE CLOSELY-SPACED RWYS; THE LACK OF A TXWY BTWN THE RWYS (LIKE I'M USED TO IN PHX); AND THE LACK OF COM FROM THE CTLR; AND THE INCONSISTENT USE OF HOLD SHORT REMINDERS BY TWR CTLRS. SUPPLEMENTAL INFO FROM ACN 551456: TWR SUPVR SAID HE DID NOT SPECIFICALLY ISSUE A HOLD SHORT INSTRUCTION BECAUSE 1) IT'S NOT REQUIRED; AND 2) IF WE FAIL TO READ IT BACK TO HIM THEN HE IS PARTLY LIABLE IF WE DON'T COMPLY WITH THE INSTRUCTION. THEREFORE; SOME CTLRS DO ISSUE HOLD SHORT INSTRUCTIONS (LIKE IN PHOENIX; AS WE ARE USED TO) AND OTHERS DON'T.