Some of those changes are note very expensive. often times reliability is compromised for minor savings.
The question is that of marketing.
Can we make a marketing page that shows an easy to repair washing machine - and shows us that over 10 years, if we do the repairs ourselves - we'll save some money ? And the hassle of replacing to a new machine often ?
At least some segment of the population, the DIY'ers may buy such machines.
Often, making things easy to fully take apart increases manufacturing costs. So there needs to be a trade off.
Because of competition on prices, prices points, the fact the break downs are relatively rare. the priority is often to squeeze manufacturing costs.