I dont think you will find many people that like to see "tanking", but the only argument I see is that it sucks because someone that is not you gets to play the "tanking" team 19 times or whatever.
But how is that any different than when you get stuck in a division with 4 teams having 90+ wins and two of those teams miss out on playoffs? And then some other division has 1st place with 84 wins?
Its the luck of the draw any time a season starts really, either way. Sometimes you have really strong opponents in your div and its tougher for you since you have to play them 19 times and sometimes you get an awful team that you get to play 19 times.
And you cant play the "well its against the rules if you arent trying to win" - in capecod's case you could argue that he is trying to retool his team to win later instead of this season, and he did say he actually gave it a whirl for 5 seasons to no avail before adopting this approach to retool the team. I think thats perfectly reasonable, no pun intended
Meanwhile, completely separate train of though - this is a baseball simulator. PT mode is free and there are no prizes. There is literally nothing on the line, other than I guess to say you won such and such league. Many people like random things about OOTP like historical leagues, seeing how so and so would do in such and such scenario. What is X and Y played on the same team. Etc. If someone wants to field an all X team and see how they did in perfect league, why cant they? Or if they want to send a band of bronze and silver misfits out there against "perfect level" competition, why cant they? Or if they decide the expensive team they built just isnt cutting it, and they sell most of their players so they can buy other players or buy packs or change their team concept, why cant they?
Who is any individual here to dictate what another can and cant do for their enjoyment of the game. If they managed to get their team to perfect league, then havent they earned the right to do whatever they want for a season? If they truly are "tanking" then they will be out of the league next season anyways.
I personally think its fine for people to do whatever they want with their teams, within reason (as in nothing that seems like an exploit or intentional up and down league hopping over and over). There is no reset/rebuild option, so people have to take matters into their own hands if they are trying to do that. And if one of these teams happens to be in your league/division, deal with it. People have to deal with mega teams when they start out and play them when they are in bronze, silver, etc. Thats not fair either. Nor is it when the luck of the draw places 4 90 win teams in your division. Or various other scenarios.
In capecod's case here though, I dont think he is doing anything wrong as described by his post.