think about the differences of having a dual and having a bot.
when a player activated a bot, the real owner of the account stopped playing but the account will keep on doing the progress.
when a player plays with a dual, the real owner of the account stopped playing but the account will keep on doing the progress.
when a player paid for a bot to do his work on developing his account (automation) . His account will be banned.
when a player hire another player to work on developing his account (automation) . His account will not be banned.
the main purposes of getting a bot are:
1. Farming non-stop
2. Alerting Incoming attacks
3. Constant development
the main purposes of getting a dual are:
1. Farming non-stop
2. Alerting Incoming attacks
3. Constant development
For a more complete information,
https://www.travian.com/international/gamerules
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The use of scripts and/or bots to automate actions on the account or to resemble premium features is forbidden.
This includes, but is not limited to, the following actions:
- Raiding other accounts automatically (and sending attack waves automatically)
- Starting adventures automatically
- Building and upgrading resources fields and buildings in villages automatically
- Scanning the map automatically
- Scanning the statistics of other players automatically
- Pushing resources to other accounts automatically
- Training troops automatically
- Placing bids in auctions for items automatically
- Starting celebrations automatically
- Scanning own villages to display village resources and information in one place
- Any other automated actions performed by third-party software
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I don't see anything wrong here.
1. They are very different
2. I'm 100% sure that my duals will not perform those actions performed by bots
3. my dual is not a 3rd party. he is my cousin or brother or my mom or friend or whatever 
4. It is absolutely okay and my duals will not result in unfair advantage against the majority of other players
Furthermore, dual feature is very good for travian community. Wondering why?
1. Players will be able to bully new players far more effectively! We can have more fun and kicking out new players means there's less competition right ?
2. We don't need any gold. Why buy Travian Plus when you can just get a dual to upgrade buildings nonstop and manage everything my ourselves ???
3. This method allows us to defeat even those gold players! We can get rid of those gold players without having to spend golds ourselves, so fun!
Lastly, since Travian surely operates as a business, we should think about the opportunity cost of course.
We need to evaluate the business decision's effect on profit and customer satisfaction.
So ,let's consider what we gain and what we lose when we keep the feature available 
if we keep the feature:
1. Non-gold players who use duals will keep on playing the game ( They probably consist of only about 10% of the community or less )
2. travian's player base will keep on decreasing because the majority of new player will quit (from around 20% player growth rate into -5% maybe? )
3. Gold players will stop playing, or they will spend their money to hire a dual instead because dual gives more advantage than Travian Features.
(Loses around 15% income each year)
4. For gold players who doesn't quit but they found a friend to play with him as a dual, he will spend less gold (Loses around 5% income each year)
5. Old players will eventually stop playing due to unfair advantage (loses 3% player base)
if we delete the feature:
1. We lose 5% of the community because players who use duals get upset
2. 5% of dual users will keep playing the game (dual players have high motivation to win, they are addicted to the game and will just keep playing) LMAO
3. New players have better gaming experience ( from -5% player base growth rate into +20%)
4. Golds players will allocate their spending on golds as usual because they can't hire duals anymore (15% income increase)
5. Gold players who enjoy playing together will keep playing on separate account. An extremely high chance that they spend golds on both accounts
( number of active accounts on server increases by 5% and income increases by 5% )
6. Old players will stay because the game is still competitive and not overwhelming ( increase 3% player base)
Dual feature gives so much advantage for travian, we should definitely support it guys!