Her song, "Happy than ever" was very typically applicable for expressing individualism abiding liberal idea and that detached tone was very simmetrically different from e.g, Demi Lovato's "Cool for the Summer". 

Because Billie's one is very sadly told in sung melody tone, in own emptiness and determined detachment, on the other hand, Demi's one is reliant on very passionately analyzed stance expressing own minor melody and speedy tempo rhythmic running. That groove with symmetrical lyrical contents make listeners own coolly distanced attachment, on the other hand, Billie's tune is very attached own disappointment and despair dryly expressed.

Of course, all those were my own subjective impressions. Nevertheless those could be very appropriately valid for some useful symmetrical strategy interpreting criticism, you know.

First, e.g., Demi's "Cool for the Summer" sung tone was expressed at passionately disappointed or disillusioned emotion through her singing tone with daringly used groovy rhythmic running. 
On the other hand, Billie's it was merely emptiness dominant tone running, that typed strategical option means rather ideologically liberalism's own disillusion signified emotional expression, additionally rhythmic tempo was so slowly easy. 
That was otherwise made through California's own dry liberal political spirit, but at Demi's case, Texas earthy cultural city ambient abiding own passion was easily interpreted, if we neglect Republican local strength at Demi and Democrat local it in relative interpreting, Billie's own option must mean so detached despair future discribable possibility affirmation which can be found to general listeners.

Demi's song tune was released at 2015 as 8 years ago, meanwhile, Billie's one was done at 2021. Those 6 years gap could not be so integral, but a littler bit COVID crisis dominant days' releasing by Billie was not neglected there.

Billie's easily made lazy mind mood is symmetrically heard, even now against very tightly actively listened impressionable Demi's one which could mean age overshadowed atmosphere abiding very touchy gap or so can be felt sociable for us as general listeners. Demi's song realease was not relevant with COVID.

Certainly lovers only having own selfish romanticism certainly is not calling general citizens, nevertheless, with consciousness of COVID, the releasing days situation was taken into account, now Billie's song's message could be interpreted as very annui atmosphere for listeners. 
But in fact, creator Billie was not so conscious about the condition, everything was accidentally given to us, but a song's released impact must have that uncertainty abiding factor too.

Anyway, very passionately described Demi's lyrical message was heard at least to me, passion's betrayal in detached dissatisfaction. 
But, Billie's lyrical description was heard so sadly introspective own abandonment. That attitude is love's ideal demolished expression. Billie could follow love's own perfection. On the other hand, from the beginning, Demi was not following ideality, because originally for her love meant merely physically necessary own carnal satisfactory greed.

Ultimately notionally perfection demanded Billie's lyrical message was home abiding, on the other hand, Demi's own love means merely not mentally, more physically demanded degree abiding accomplished estimation.

Nevertheless, both two gapped love mentioning messages are unexpectedly crossable these days' own west and east camps divisionary global reciprocal contradictory situation days. 

In other words, these days own blackened future hope devastated situation makes these very gapped love definitive lyrical contents and spirit unexpectedly crossably heard to our mental ears and spiritual mind.

Of course, these factors' analysis is not essentially both songs' own value, so necessarily. But...

(Irregularly continued)

June. 20th.  2023

Appendix ; My essay title reason consists in that Billie's lyrical message must mean popularity's own invalidating intentional display, though in this term, her lyrically expressing is not based on only tune's groove, but metaphysical lyrical significance. 
On the other hand, Demi's tune is very dependent on her physical singer's physiologic sensitivity risen on tune's sprinting groovy display, at least at these two songs, the gap could be interpreted. Of course, at any other song for them, necessarily overturned facts must be found in analysis.