Yes, but is that a problem? Usually you sell your ICE, you don’t trash it when you buy an EV.)

Yes if we want to reduce total consumption of polluting resources. Depends on each person's circumstance, if you need to drive then it's better to keep using your old car but use it as little as possible and look for opportunities to replace trips with walking, cycling, public transport, etc. Rather than buying a new EV but still driving everywhere even for short trips.

I mean, is it more of a problem than trashing an ICE car when buying a new ICE car? It's better to use an old ICE than buying a new ICE car, too.

I think so from the bottom of my heart and try to live by it.

No, because you don’t scrap it, you sell it. That imperfectly reduces the demand for new cars.