Ye olde Tridents were heavy. There's no way to sugarcoat it, modern bikes are an absolute joy to move around compared to the bikes of the seventies and eighties. I really feel for the older riders having to sell their old 750's and 1000's due to weight, but completely understand why they have to do it.
But it's not just the struggle onto the centre-stand, or moving it out of the garage. You sort of rely, quite heavily (oof is that a pun?), on the brakes to haul all of that extra weight up. And a fixed, two-piston caliper, on a small solid disc, needs to be in pretty good condition to do the job.
Well this bike is a 1974 model... and it is now 2022, and this is probably its first seal kit. It's done well! Not that it was leaking or anything. The pads weren't binding on the disc either, in fact, everything was pretty good. But the old seals were pulling the pistons back further than they ought to which, to the rider, means much more lever travel before retardation takes place.