A quick google seems to have many good things to say about 7 string, and the answer to “whether someone should buy a 7 string” is majority “yes”, without stating possible issues. And objectively it make sense: 7 string is just 6 string with addition of low B, so on songs that don’t use that string, just don’t pick/strum it. Yet, to my knowledge, artist that use majority of 7 string are few. Aside from a few metal bands, the only other new groups I can think of that utilize 7 string is Babymetal; much less so in Blues or Rock or Pop. Even Steve Vai seems to play less on 7-string nowadays. So why isn’t 7-string guitar used more in practice? Specifically, are there some issues on 7 string (especially those on 25.5 inch scale) that a 6 string is more benefical?
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You don’t want to clutter a given frequency range would be my best guess. For example, in the Brazilian genre Choro the 7-string guitar is widely used to play both the bass line and the main melody. The “exchange” for it is that it doesn’t use the bass or similar instruments, because they’d be disputing the same frequency range without that much of a timbre difference. Choro arrangements for 6-string guitars, on the other hand, tend to include a double bass, bass guitar or tuba
In heavier styles of metal, the 7-string guitar ends up being desirable because either the guitar has so much distortion it doesn’t clash with the bass guitar at similar frequencies, or the “muddied” sound is actually desired
And since so much modern music is written as to be “comfortable” to play in a six-string guitar, you more often than not have to transpose the song, unless you’re only playing power chords, in which case the 7th string might actually help a few times
There’s also the minor factor that the higher strings can resonate with the lower strings’ harmonics and create unwanted “fuzz”
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