Absolutely! The 2015 laptops can support the much faster NVMe M.2 storage drives whereas the 2011 can not. I currently have a 2TB Western Digital NVMe M.2 drive in my mid 2015 15-inch MBP with disk transfer speeds of as much as 2400mb/sec to 2500mb/sec. At best your 2011 disk access speeds would be around 400mb/sec. A huge difference.
Also the graphics processor found in the 2015 laptops are metal-based so it can run MacOS up to the current vers 14.5 Developer Beta which my 11-inch AIR and 13-inch MBPs are currently running without any issue.
I was able to obtain all my 2015 laptops (see sig below) for around $300 with my Air being the cheapest acquisition at $95. The Air was advertised as not being able power on so everyone stayed away from it. I purchased the Air and found out the reason is because the battery was completely discharged and the seller chose to sell it as a non functioning laptop rather than try charging it up first.
The point being if you really know what you're buying and know what to look for in an eBay auction you can source a very nice near mint 2015 laptop and then get a Western Digital NVMe M.2 and Syntech adapter to boost your read/write speeds for faster performance and then run the latest MacOS using OCLP and have a decent laptop for minimum investment. In my humble opinion, not everyone requires cutting edge performance from their computers and rather than throw money away on a device that will rapidly depreciate over time, I would rather source one of these build to order laptops (in their day) for pennies of what they originally sold for and still be able to have years of good usage from them without throwing away lots of money. Of course if you have to have cutting edge performance from your computer so that you can access the internet, watch videos, check your email and do simple video editing/photo processing then by all means feel free to get the newer Apple products but keep in mind you can not upgrade your storage drives or change out components like your display, trackpad, or logic board without it being disabled for some reason due to Apple's anti-rights to repair attitude.
Yes the writing is on the wall for all Intel devices but for now I am content using my 2015 laptops for at least another 6 more years before I have to decide to either upgrade or run a different OS on them. Sorry about being on my soapbox there.