Performance fit while being comfortable is super possible! I’m 28.5 on the brannock but put myself in 26.5. Took a lot of adjusting and I have full access to a boot punch. I have spent 10 hours 5 days a week in the boots, no pain and no movement.
for your average person to do it it requires patience, a good relationship with a good boot fitter and obviously a little extra budget on top of your boot.
go into a good fitter, preferably at the start of the season. Be very very clear about your needs, your skiing style, etc. buy the custom footbeds. Be very articulate with what you’re feeling in the boots. Listen to the fitters advice and ask questions. Be prepared to go back a couple times to get adjustments until they’re perfect. Remember that your bootfitter probably deals with annoying geriatrics on their 6th visit all day. I’d personally way rather be working with your average NS type skiier. I absolutely do not mind doing little adjustments either way.