tune down to Eb yes or no

Well, I don’t really tune my bass down, but, on occasion, I play with a guitar player who does tune down a half step. I hate playing my bass lower than standard tuning as you lose all the response of the strings so I purchased a DigiTech Drop pedal that allows me to keep standard tuning on my bass and play at whatever point the vocalist wants us to play. 

Current band, no.

In the past, yes, mainly hard rock and metal bands I've been in long ago.

I actually really liked it, it fit with what I was playing at the time.

Not usually, but it doesn't matter to me. The last band tuned down to make things a little easier on aging voices.

Eb.

Started with Hendrix and SRV obsessions in high school.

Then noticed later that it fits my vocal range much better.

Capo 2 in Eb standard tuning is where it's at.

For solo acoustic I tune down a half step. For electric I'm in standard.

On the Gibson J45 it simply sounds better with fatter strings tuned down a bit. And since I am solo I don't have to worry about other people adjusting.

However for the band I've tried it both ways. If somebody else is doing most of the singing then I adjust to him and play in this register. I also agree you can tune down and then capo the first. There is a bit of a learning curve because the dots don't line up but it's not that big of a deal. There is an advantage to that--it lowers the action and the first position chords are easier to fret.

My solution is to bring 2 guitars.

Digitech Drop pedal for me. I rarely use it for Eb, but I would if playing along with Jimi or SRV.
In one of the bands I'm in, we tune down (with the pedal) one whole step for a Zeppelin tune. We're thinking about adding a couple more Zep tunes also.

nope.

As a Country guy... some songs I'll drop the 6th string down to a D... but that's about it

Depends on with whom I'm playing. Standard, Eb, drop D, etc. All bets are off! It's probably one of the reasons why I prefer Teles and Les Pauls...no vibrato bridge issues to contend with.

I tune most of my acoustics down a whole step to D. I have some in Double dropped C and open G. In 40 years of gigging I've never played with a band that tuned electrics to anything but concert pitch. I love playing with a capo, especially on acoustics in non standard tuning, and I'm happy to capo up to the 7th fret, at least.