The issue that spurred all of this is that rentals don't have any delegation cooldown and people can use them to more or less bypass energy limitations on an account. It creates a situation where it's more beneficial to cycle accounts to get twice as much energy/earnings via renting instead of owning cards. Making rentals not able to be cancelled would make for a better user experience but not close the exploit. One of the earlier discussions before creating polling and proposals for this issue involved creating a cooldown similar to delegation for rentals, but ultimately it was viewed as an ineffectual solution and problematic for card owners again.

For example, if you add the delegation cooldown to rentals, then owners would be renting roughly half as much, which could lead to cycling more card rentals throughout the duration of a season, but would ultimately be a net negative impact to owners that do want to rent and wouldn't solve the problem as people could then just rent someone else's cards for 2 days and repeat the cycle. There's no perfect solution here, but the season rental approach is the best that was presented during the discussion/debate leading up to the proposal and it seems like the proposal has a strong majority support from SPS stake.

While I'm not opposed to someone presenting a better solution, we've explored many of the suggested 'better alternative' lines of thinking and potential solutions before getting to this point and seasonal rentals are the best way we could figure out that closes the exploit while it also encourages card ownership and creates congruency in the rental system going forward as both land and survival mode will only work with season rentals. Having all card renters move to season only will hopefully create a much better overall price for season rentals as they become more competitive with all renters focused there instead of split between daily and season rentals.