Software updates for Galaxy S10 plus

Bro literally their's no fault of samsung in this...
Every phone gets supported for a certain period of time...
when Galaxy S10 Series launched in india, from that time to march 2022 it got rock solid software support by Samsung
But as of now as it's on it's 4th year ak (last year) of software support, that's why it's been shifted to quarterly update schedule
Apple gets the longest software support coz as you already know that apple only releases it's flagship lineup of iPhones Every year. But if you see the Android industry, brands launch multiple device's in a year including budget, premium mid-range & flagships too & Supporting each & every device for 6 to 8 yrs is literally not possible... apple supports it's devices longer coz apple only has it's flagship lineup to support so that's why their software support is usually longer than any other Android manufacturers
I hope you got my point 🙂

Apple is still giving updates to their 6s series, 7 series, 8 series whereas they are in with 13 series. So, they are more customer centric than Samsung i think.