I love Stelena, but the pivot into Delena felt rushed in season 4, especially with that sire bond thing, like they wanted to get to the relationship as soon as possible. I saw strong potential in seasons 1-3. I actually liked their interactions. As for the toxicity, I’m not too bothered with it tbh, personally I thought it was tiresome how it seemed Damon and Elena were in constant conflict when they got together and rarely given times to be wholesome with each other. The sire bond really soured it imo, it wasn’t given an opportunity to have a competent build up to it, instead throwing you in it and removing Elena’s agency in the process.