That's an interesting question; Kindred has supports that they like to have for general gameplay and others that make good comboes. For instance, both Soraka's and Morgana's ults pair amazingly with Kindred's, but they require precise timing and are useless if done wrong, not to mention neither of their regular kits work amazingly with Kindred's.

On the other hand you've got champions like Pyke who plays a really strong lane with Kindred and can work with or without you in lane as an aggressive playmaker that needs to be focused down, but Pykes ult actually clashes with Kindred's unless the Pyke can get that timing exactly right and the Kindred player fully trusts the Pyke.

It honestly depends the most on your own personal playstyle and if you know your support. Most things can work, but I recommend checking the matchup section near the top of the guide for details.

Thanks for reading and enjoying it!

Kindred is sadly not meant purely for the ADC role by nature of her marks; in the jungle they are free to roam and contest marks across the map, whereas ADC Kindred is limited to the bottom half of the map for the entirety of laning phase.

As far as what they could change, they have honestly done a lot for Kindred simply by strengthening her play and reducing her reliance on marks. The other issue is that, in order for her to become meta she has to compete fairly against other ADCs, and the reason they work so well now is because your enemies will not be used to their damage and mobility. If Riot wanted to open her up to regular ADC play they would have to increase her range to what it is at 4 marks as her base range instead, perhaps even removing jungle marks altogether in addition to removing/reducing cooldowns on player marks, making them much more focused on bursting down each individual target during team fights in order to scale but not punishing them for lack of early-game movement.

Just my general thoughts on that, and of course it's up to riot and I don't see them making changes to Kindred anytime soon.