Eh, hard disagree on that, unless you're of the opinion that representation doesn't count, unless it's the main character. Damn near everybody on that show was LGBTQ and, unlike Legend of Korra (which I love: it remains, to this day, the best western animated series, ever, IMO), they didn't wait until the last season to hint at relationships, let alone wait until the finale to pull the trigger.
With respect to Harley Quinn... is the way they did it really any less of a "ship tease," if they don't get a third season?
My argument is more the using the final episode for the big damn kiss. The relationships and other characters were definitely representation but it feels like cheating if the goal of the
main relationship of a 5 season series was to be romantic, mostly in subtext albeit there, only to literally have the kiss in the final episode. Granted, that was clearly predicated on behind the scenes stuff but it's still there that it couldn't actually be text until the series finale.
With the Harley Quinn series, it falls into the LOK/She-Ra realm for me if it doesn't get a 3rd Season (I really hope it does mostly to subvert this exact scenario). Also it could have easily been a "ship tease" if they had Ivy marry Kite Man. Instead, they actually went half-text with Harley admitting her love to Ivy thus guaranteeing at least a one sided love before making it text in the finale with Ivy declaring her love towards Harley.
The reason LOK and She-Ra got such publicity was precisely because it was
the main character being involved in same-sex relationships by the end of the series. LGBTQ representation has been improving but too often it's been... background characters or depending on the show, the token
gay friend or
lesbian friend unless it was a series like The L Word or Orange is the New Black (or even She-Ra) which incorporated many such queer characters. Willow on Buffy coming out was so big because she was one of the core lead characters and even then, Joss had to fight to incorporate a kiss scene in S5 (2001) then it wasn't until S7 (2003) that Willow was shown in bed with another character sexually.
For a lot of LGBTQ people, there simply aren't main characters to champion behind unless it's specifically a queer ensemble show or a queer designed movie. That's why a television show like
Batwoman is so important or even a teen show like
South of Nowhere was (and IMO still is) so revolutionary because its leads can have same-sex relationships that aren't background or side romances barely featured.
Finally, a lot of 'queer' relationships get denied into subtext territory behind the veil of "best friends" to where the physical actions/phrases would be 100% romantic if they were opposite sexes. That just gets tiring and annoying when you see two characters be physically affectionate with one another and have blatant romantic subtext be like, "I love you, ___. You're my best friend," or "I'd do anything for you. You know that. You're my best friend and I love you," as the qualifier to make sure to their straight audience that it's totally platonic.