I'm stuck working from home at the moment, and I like having my workspace backlit. This feature would be pretty nice for a lot of folks like me doing the same.
Issue a) Lightstrips generically.
They are nice for situations where you just want some glow, not "massive" amounts of light. One example is behind a TV (this makes the TV surprisingly nicer, even if you stick to a fixed color, not changing colors or ambilight or suchlike). Another is above your bed behind the headboard, if you read paper a lot. (It's probably not good for reading off a tablet because of reflection, but your room geometry may vary.)
A third case is if you have people walking around the house late at night, to create a light that's good enough but not too strong in a hall or stairs or kitchen.
If you just want to experiment, Ikea sell a lightstrip (superbasic, white only) for like $5. (For that price they don't include a USB charger you will have to buy separately, which to judge from certain iPhone12 rants, is the most difficult and expensive thing on earth, so be warned...)
Issue b) Fancy color changing light strip.
I'm not sure I see how I would use that in my house, rather than a basic on/off white strip. But I live in LA and every room has lots of sun right now. It's possible once winter really kicks in and the rooms are darker I will start to see places where it could add to the tone of the room.
My general feeling with all these items (ie fancy lighting, nice HomeKit stuff) is you honestly can't tell how you'll use it and feel about it without experience. It's hard to sniff and mock that you don't "need" something you haven't lived with. My philosophy (and I'm still very happy with it after a few years) is be willing to spend whatever you can budget (for me it's about $100/month) on experimental stuff to make the house nicer. I'd say about $20 of that $100 is wasted on average BUT the $80 that isn't wasted makes me so happy that it far overwhelms the $20!
I didn't think I'd like the Ikea light strip for book reading as much as I do.
I didn't think I'd like backlight LED's behind my TV as much as I do.
I REALLY like how I basically never switch on or off lights in my house (they're variously controlled by sun location, by a smart light sensor, and by presence), to the extent that it feels offensive when I go to another house and have to control them manually, like an animal! Likewise for smart blinds.
(And the same goes for some non-tech things. Foam mattress topper. 1000 thread count sheets. Foam bathroom mats. A very nice [functionally, not artsy] night stand setup. Light diffusion film on some appropriately chosen windows.)
On the other hand, I was disappointed by full color hue bulbs. Technically they work, can't complain about that. But they just don't solve a problem I have. I've tried using them in various ways and nothing has really stuck as something I care about.
Variable color temperature I'm still not sure about. I have my own hacked up Adaptive Lighting version right now (looking forward to when I can switch it off and rely on HomeKit doing this!) and, yeah, sure, it's nice. But (for ME! your milage may be very different) it's not a life changer, not something I care about nearly as much as, say, smart blinds.