Which tire should become replacement tires Uralt vs. little profile and slight cracks

Hello together, just had serious discussions with my workshop with which I am otherwise very satisfied: I had had 4 new summer ice creams installed today and wanted to have my replacement tire which is 42 KW 1992 (no joke, my Toyoty Camry is BJ93, that is the original equipment) which has super profile and otherwise also “good” looks through the old summer tires 44KW 2004 2mm profile and slightly cracked in the grooves – not at the flanks – until today, because I dach In case of emergency it is better to use 8 years old tyres which were always used instead of 20 years old tyres which were never used to roll to the next workshop. My workshop then left me the first tyre so, because it has still so much profile and looks much better than the old summer tyres. “And profile is important” Only after I asked again on the internet for the age of tyres and got confirmed that 20 years really too much of the good I insisted on reassemblying the spare tire. it really cost me a lot of arguments and I stood there like an idiot of crazy things. Of course 8 years and 2mm profile is not optimal, but m.M. still much better than the 20 year old tire. Ideal would of course be a NEW spare tire, but who has so much money?a What do you think?