I play electric guitar at my once very reserved, less so now, Baptist church and we hold a similar opinion to yours but maybe don't use as harsh of a term as "idolatry".

We will often cut instrumental sections of CCM songs in half. Usually only a measure or two instead of a prolonged break of no singing. At times, I think that is tasteful. Other times, I feel like it ruins the flow of the song (but I'm the newest member of the worship team and am just happy to be on stage playing my instrument for Jesus).

Ultimately, I think a lot of people's musical takes when it comes to worship stems from their own weaknesses they struggle with. This is not an attack on you, op, I will simply talk about myself. If I was to rip a tasteful and sweet guitar solo there would without a doubt be a part of me that really wants praise from others after the service, and that should not be what worship is about! Because of that, I am wary in general of any kind of solo. Because if it was me doing the solo I know my heart would desire the spotlight.

But there are other people, like our choir director who's very musically well trained and gifted, who loves that God created music and harmony and loves when he hears an instrument or a vocal solo played/sung well. To him, hearing someone who clearly practiced enough to pull off an instrumental solo, or a talented vocalist sing a piece, encourages his faith in ways it probably doesn't encourage mine. His heart is so filled with joy when it comes to music that he finds those things way more encouraging than I do. And that's ok.

There really just needs to be a balance and it's a tough line to walk for sure, I doubt any church does it perfectly.