A 6th gear & gear indicator would be great.
Better access to the battery, without the need to remove the o/s panel would also be handy, when needing to charge or jump start the bike, as I often have to do, being a "fair weather only" rider!
I've no problem with the weight, it's no secret.
Basic pre-purchase research into the bike's spec should be done. It's a big blokes bike. If it's too much for some, they should choose a lighter bike.
Most of my riding is 2-up, my partner loves the riding position & the comfort that brings, compared to many other bikes. This reduces the amount of earache I get LOL!
My ST1300 is by far & away, the best bike I've ever had. Boringly reliable, & relatively easy to maintain.