I refuse to buy bike frames that have internal routing. In a weak moment a few years back I did buy a Protour-level $8k bike with internal routing. The initial build was such hellish misery that when I later had to replace a rear cable, I just hung up the bike to collect spiderwebs. - for 3 years.

Thank God for Chinese carbon off of Ali-Express. You can get standard threaded BB shells, rim brake fittings, and external routing... all the good stuff.

The only positive for internal I can think of is for bike retailers/service shops, as bikes are becoming so user -unfriendly to work on, that cyclists are locked to their shops for every maintenance task.