I wouldn’t think deleting anything is called for, and apologies if I came off too strong. It’s just that there’s a lot of FUD out there, perhaps some of it unintentional, about what DV certs (like those issued by Let’s Encrypt) do and don’t do. Relevant to this thread, and to the link you posted:
- Any type of cert (DV, OV, or EV), if issued by a trusted CA, will give at least a green padlock if your site is configured properly (which mostly means that you aren’t serving insecure content as part of your page).
- Any type of cert (DV, OV, or EV) will work with mobile devices
- Any type of cert can have any supported key length (I think the range is 2048-bit to 8192-bit). No type of cert is “more secure” than any other in that regard.
- Any type of cert can be used with any valid encryption algorithm–as above, no one type is more secure than any others.
- Wildcard and multiple-domain certs aren’t alternative cert types to DV/OV/EV; wildcards and multiple domains are orthogonal issues. You can have a wildcard DV cert, a wildcard OV cert, or a wildcard EV cert (as long as the CA/B forum guidelines permit it)–LE will begin issuing wildcard DV certs early next year. Similarly, multiple-domain certs can be DV, OV, or EV–LE currently issues multiple-domain DV certs.