Alphabet aka Google is just one example in discussion here because Android is now present on more than 75% of mobile phones in market & in use.
you can search "Monopoly" law suit & your favourite hardware/software provider for your own understanding of their ecosystems.
Apple drives its monopoly with lowest hardware & software interoperability https://interoperability.news/
Apple admirably recently provided OS upgrades for IPhone6, which is 10+ generations older than current one.
Most OEMs are rolling out security updates quarterly but the OS updates do take years to roll even for the flagship devices because of the porting, testing & release infrastructure effort needed.
https://www.androidauthority.
Now that Sony & Motorola are out of the android OS updates time race, Only 2 companies are currently pushing fastest android OS updates Google & Samsung.
Samsung announced that all devices from 2019 or later will get 4 years of security updates (not OS updates). That includes every Galaxy line including mid-level ones. Some flagship devices like the Galaxy S23, Galaxy S22, Galaxy Z Fold 4, etc.. are scheduled to get five years of security updates (not OS updates)
So even if Google does pull another stunt like its weird Android 12 & 12L OS releases, 2 Android OS Updates should keep Samsung mobiles updated & relevant for approximately 1.5 years at the very least.
Google has been forcing OEMs to launch new phones with little or no hardware change, or lower hardware for pricing competition or just to support newer Android OS architecture which Google has been drastically altering very frequently.
OEMs have & are still trying to create alternatives but Google has managed to monopolize & severely restrict other OEMs here too (read anti-competition/anti-trust)
https://cellularnews.com/
devices 2-3 versions ahead with significant hardware improvement down the line (read 2-3 yrs.) might present performance value proposition, but the immediate next version can rarely provide any significant value proposition in terms of hardware & software performance/security improvements.
Since both above conditions are almost always false, so the probability of whole conjunct statement being true is infinitesimally small ==> tending to zero.
hence proven by contradiction without shadow of doubt; that the newer devices are not necessarily secure & faster to begin with & gradually evolve to become more secure through security updates & faster through performance updates.
Q.E.D.