Seems very odd to me that someplace would force the use of a particular development tool. I've seen it only one time while interviewing, where they wanted everyone to have identical setups so they could easily hop onto each others computers when needed... it was weird and I took it as a red flag and didn't follow through them them.
Some software development workflows require specific tooling, with complex setups. While it may be possible to do with other tools, it's often very difficult, and not really worth the trouble when there is a known working setup. It's easier to onboard new people if they use the established toolchain with known working configs. I worked at a place once where it took several days to get the dev environment set up. It would have taken far longer if someone wanted to use whatever random tool they'd prefer to use.
That is a massive red flag to me too. They are basically saying "you are identical to everyone else, and easily replaced."
This is common in many companies, IT wants standard development environments.