I think people are exaggerating the difference between different size frames. If you look at a typical frame geometry table:
https://www.sheldonbrown.com/bridges...-geometry.html
You'll notice that the 55cm frame here, has a 54cm top tube; and the 60cm frame has a 56cm top tube. Notice the 60cm frame does not have a 60cm top tube. So it's a measly 2cm difference in top tube length between 55 and 60. You can easily take that up with a longer stem or a deeper reach handlebars.