Sure, if you might need high draw on something that is NOT a weaponlight, an IMR or INR unprotected cell is a great choice. Want to build an electric drag bike? Use IMR cells.
That Keeppower P1835J that I reccomended has over 3100 mah (~3150 I believe) at a 5A discharge output. Well more than enough for any reasonable 18650 application or flashlight where you would even consider a protected, button top, standard chemistry battery. It trips the protection circuit due to heat late in a 7A draw, so it loses capacity there (but not that much from voltage sag) . It can do intermittent 8A no problem, but suffers from voltage sag, cutting capacity at 8A intermittent as well even though it is rated at 8A continuous duty.
HOWEVER; A 3A and 5A draw capacity is IMO what anyone considering an 18650 for a weaponlight should be looking at. No normal flashlight will pull more amps than that and it covers all the lesser uses such as optics, electronics, battery banks, etc.
The Keeppower P1835J has a 1.5A rated charge current, so you get long life at a standard 1A charge and are getting reduced cycle life at 2A charge, but you CAN quick charge at 2A on occasion when necessary. IMO, cycle life for a weapon light is just not a big deal anyway. If you get 350 instead of 400 recharges going from 5% to 100% before the battery is worn (degrades to 80% of its original capacity) that is still more charges than the average user will EVER need for as long as they own a weaponlight. Throw in a second battery so you can put a full one in and let the other charge and even a cop on night shift who runs a battery down each shift on a handheld 18650 flashlight can go years before needing to buy new cells.
I have not seen what that 3000 mah Molicel P30B has for capacity at 5A draw. but I know the 2800 mah version is less than the Keeppower P1835J. Unless it is at least 3100 mah at 5A and under $10, the Keeppower is the better buy.