There are reason for odd sizes as to increase the traction and high speed/cornering stability.
Most RWD cars & performance rides does got wider size for the driving wheels

My fathers BMW e90 320d is a good sample (Original FR 225/45/R17, Rear 255/40/R17), changes 1 time same 225/45/R17 for all tires after that regretted.
Why? -> Driving dynamics really felt weird and sway a lot in the rear when picking up or enter corner fast, especially rainy days even felt more worse.
Only good is fuel consumption might be better a bit as it is lighter.

Unless you drive very slow (Which i doubt for most continental drivers) there are reason why the engineers put in the odd tire size at first.

i banana... just recognize the sketches... what issit you wanna say?
within +1 -1 you can't feel any different... some cars even have 3 rim and tyre sizes on the sticker... eg 17/18/19"
any bigger tyre guy probably tell you not to do it... anything smaller your car look silly...
anyways best you tell us you wanna upgrade from what size to what size... ppl here can tell you ok or not...
all these king pin and scrub radius you asking are very technical/theoretical but in real world application if the changes are within the norms you will not encounter any problem

how many years can a tyre last before needing to change ? some say 7, some say up to 10.
more than 50% thread left and always parked under a shade.

Wta when taking car to tyre shop for alignment and balancing do I need to tell the guy that I change my tyre spec to bigger tyres so it’s different from manufacturer spec or it doesn’t matter???

Nop, i have to disagree if for modern allignment machines. Recently i bring my ride to do alignment and the shop latest alignment machine software got list out all the original tire size from the car model, when detected different size (especially larger size) will impact height = camber settings will off. Especially if knew lowered or tire size change, they will need to custom settings and cannot follow the original settings.

All around improvement.
Increased grip & handling during dry & wet.
Major aquaplaning resistance.
Lower noise.
To me, VP3 was such a lousy tire. Poor grip during dry & wet. I've dump the tire after less than a year & 10k ish km.

In my personal view, Primacy 5 is more aesthetically pleasing than Primacy 4.

Looks like its wheel alignment (Rear ??) is less than desirable IFF within specs....

Performance tires people dont talk about wear, as it is expect to wear out fast. If you want long wear tires better get normal touring tires like Primacy series. If talk about comfort, no need look for others even the website also Michelin score better. FYI each person also subjective in term of tire wear, if the person always go track even few thousand km also already wear out.

My SUV tyre is almost due, 265/65/r17. stock comes with using Toyo HT, Im tempting to change to YOkohama G018 AT. Any comments or better tyre recommendation? (I dont go offroad btw..lol)

wanna rant abit.. cos i saw tire thread..    last year bought 4x hankook vertus prime 4. grip comfort sound all ok for me.  week after install rear left tire got punctured.. and many more.
last week early morning while heading to work I saw that tire abit flat, so I decided to drop by a petrol station while otw to work. by the time reach the petrol station it was fully flat. I shocked, I immediately pump to full, since the shop was less than 5 mins i away i just drove there.  by the time i reach tire shop it was fully deflated again.  So i knew it was bad. then we pull out 1.5" screw and it was located close to the side wall.
patched up the hole and saw the sidewall near the puncture a bit bulging. die...
drove to work. finish work, aduh, flat again. had to change to spare tire.

next morning headed to workshop took out that tire, counted 4 patched (inc latest) holes since I bought the tires. and found 1 extra hole not yet patched.     so that particular tire had total of five punctures!!!!
Anyways if got see puncture, terus swap spare, dont risk driving further!    lesson learnt.

I always drive off track (i not pro) so my tires mostly chip/wear off a lot especially near the side wall area.