A bass usually plays one note at a time. Plus as pointed out, the high tension of bass strings leads to changes in neck bow with changes in string tension much more so than a guitar. And even worse the low frequencies of the strings makes them operate just barely into the region of decent tone so tuning down needs heavier strings to maintain tone (as mentioned).
And it gets still worse. Since a bass is tuned across the range in 4ths (guitars are not. That "b" string messes it all up) it allows you to move the patterns of scales etc. both up and down the neck as well as from side to side from string to string. Once you drop-tune a string (lowest) all that nice pattern shifting ability is gone. You have to learn a new scale (pattern) for each key etc. if a switch to another string is needed to get range.
The bottom line is that "drop-tuning" or even lowered standard tuning makes little sense for a bass. And that is especially true since there are now "real"* basses that can purchased that solve all these problems at once!
* all "real" basses have 5 or more strings.
With a 5 or 6 string bass, you have all the range you need and even better it's concentrated at one spot in the neck. You don't have to detune to get extended range so neck tension does not change so neck adjustments are not needed. And since strings retain original tension they don't have to be increased in gauge to maintain tone.
What the resistance is to a 5 or 6 string bass I'll never understand. Hey, if you are playing music that doesn't need the extra range then a 4 is all you need and more power to ya. But once you need that range, guitarist-style detuning is a crazy way to get it. So lets give Pablomigraine a big round of applause for coming to his senses in time with a Lakland DJ5. (An excellent choice by the way!)
bands that play in drop tunings use open strings alot of the time, playing an open C is alot easier than fretting the 1st fret on the B then jumping to 5 on the A, it's wasted energy and movement hense why alot of bassists drop tune and if they follow the guitarist alot of the time the guitarist uses patterns that are harder to play in standard tunings
