Any question answered...

Longer pumps should be better... But old frame pumps were awful. To clip into the braze-ons they had springs that resisted the last part of the pump stroke - i.e. the bit of the stroke where you're fighting the most air pressure and having to push against a spring as well is least welcome. Worst still even if you do fully compress the spring, the plunger usually still doesn't go near the end - air that you have to compress each stroke but that doesn't get pushed into the tyre, just uselessly re-expands on the out stroke.

The little screw-in connector pipes became a commodity and suffered from being made too cheaply. They'd constantly be working loose and leaking as you pumped, and the rubber tube had a short life before it perished.

If you run your tyres above 60 psi then avoid or old style frame pumps.

SJS sell some modern frame pumps that address at least some of the flaws, but they don't use braze-ons - they jam into the main triangle and rely on your top tube and down tube being really close at the head tube. (Although the picture in your second post implies they can fit braze-ons, or at least can be adapted to.)

Thanks for that explanation, was really helpful.

Sounds like i'd be much better off sticking with my little topeak. I can quite easily get high pressures in with it, but it just doesn't look as nice, and need to cable tie another bracket thing on etc...

Would've been nice to use those braze ons, but not at the expense of function...