I have a ~1993 Giant mountain bike. It's not great, but I am a very new and casual rider.
The bike has a solid fork and it makes for the predictable rough trail ride. The trails are generally fairly modest (I live in North Texas, a 100' change in altitude makes our ears pop here) and the surface is generally dirt (very few rocky areas).
So, I am thinking that it would be very nice to have a suspension bike. And seeing that a modest fork can be purchased for a modest price, I am wondering if it makes sense to add a fork to this bike.
This question asked about going the other direction, and there were some cautionary words about changing steering geometry.
So, on balance, is this something that I would be best off to avoid? I suspect that if I have to replace a bunch of steering parts, the cost will quickly approach that of a new low end bike.