Pedro.
You ate absolutely correct that as Geddy got older he could not manage the same notes and range as earlier life, old age sucks....lol.
This obviously has a big impact on the overall tone of their later music but also very likely on even the way they would compose later music too.
When you find limitations you tend to work around them as best you can.
Same happened to Ozzy, on the Black Sabbath farewell tour they were limited to playing songs Oz could manage to hit the notes on.
You ate absolutely correct that as Geddy got older he could not manage the same notes and range as earlier life, old age sucks....lol.
This obviously has a big impact on the overall tone of their later music but also very likely on even the way they would compose later music too.
When you find limitations you tend to work around them as best you can.
Same happened to Ozzy, on the Black Sabbath farewell tour they were limited to playing songs Oz could manage to hit the notes on.