@warllo
The ER605v1 never should have been productized as an Omada Enterprise device, it was woefully underpowered from the start, constrained by weak CPU and limited Memory (especially the FLASH, the 16MB didn't have room to include the code to support Wireguard etc.). The ER605v2 is actually a reasonable small branch/soho device now.
As for LTS (long term support) devices, those come with a price which is NOT TPlink's demographic. Keep in mind that even Cisco mothballs it's devices on a regular basis.
The truth is TPlink gateways, their term, not mine, are really just that, they simply don't have the necessary packet processing hardware to offload routine router functions (like DPI) and therefore everything must be done by CPU, which are typically low-end ARM cores, with severe throughput penalties as a result. However, for the average prosumer/soho type deployment you can get some pretty 'big boy' features without the big boy prices. It's all about getting what you pay for, and for most of what I do, it's enough.