If it’s really just for work, and work won’t pay for it, fuck it. If it takes you longer to show people stuff at work because they won’t get you a laptop, then it takes you longer. They pay you for an 8 hour day, how much you get done in that 8 hours is dependant on them giving you the tools you need.
But, my guess is that’s more of an excuse you’re using to justify financing a new toy. 