Is a Semiconductors ETF a good 10 year investment?

Or would you suggest investing in a more broad ETF instead?

I have some interest in and understanding of the semiconductor market and it's potential growth in the upcoming decades, which is why I put about 25% of my portfolio into the iShares MSCI Global Semiconductors UCITS ETF.

However, I got some advice recently saying that the semiconductor market is severely overvalued at the moment.

Thoughts?