Better is the enemy of good enough
I see so many business units that have a 'special way, that is so complicated you couldn't possibly understand it' of dealing with customers in basic tasks.
When you peel the onion, they aren't doing anything special that can't be done by the major ERP's / MRPs much better and with more standard add ons.Maybe they have one or two quirks used by 1% of the customers but these have very little effect on the bottom line or the potential to do so.
The real benefit is when you improve their process and make sure they serve their customers better.
And if you have thousands of sites it makes sense that every major tool is the same and supported by a Vendor or preferably multiple competing vendors rather than Dave from accounts.
Now there are some real niche tools that can affect the bottom line. An ex employee -> contractor wrote a tool that allowed us to report on customer units and charge a good whack for it. Now those are worth doing. However ordering, building, buying & invoicing its best to get off the shelf.
The problem is getting it across to the single business unit that they are 0.05% of the the profit so spending 10% of IT's time to increase their profit by 1% is a waste of time.
Sorry in biggish companies standardisation is the way forward.Now getting it right is more challenging and requires clever and motivated people, most of those left years ago when the accountants took over.
Also the business never appreciated the benefits of the one off's or the advice from IT as one guy said when I said - that is bad idea because of business reason X,Y & Z the order came down from on high 'just do it'. You guessed it XY&Z bit us in the rear. There followed a long weekend producing my original suggested solution and was greeted with 'well at least IT got it right at last'. Guess who got the payrise?
But if you do it with standard tools then you have to do it well, that means lightening fast networks, great support & applications that work properly, the funding for those is stored with the Unicorns.