That said, consider the flip side of the heterogeneous aspect. You were unlikely to be able to run software on two different platforms that could communicate in a meaningful way. It was duct tape everywhere. There was no "cloud" that one could get significant computing resources on. You could pay (much more) for time on a shell at uunet or another isp... or buy your own for $$$.
A 250MHz Octane MXE with 128MB RAM and 4GB disk has a US list price of $47,995 in 1998. That's $72k in 2017 money. Making consistent technology stacks has reduced the cost to the point were we think very little about the hardware anymore - and by making those decisions unnecessary it has allowed for improved portability of skills and not worrying about the abstraction of the hardware (until it leaks).