Beside the better optics - usually not worth it. Its oftrn more expensive then doing a roof and separate solar.
Less efficient as its heating up more in summer.
A solid new roof as a useful life of easily 60-80 years and more.
Solar can be end of life in 25 years (at least with much less output). The. You can only replace the solar layer with much better panels by then - not so easy with the integrated solar roof.